In 1998, Billy Bragg and Wilco recorded unreleased songs penned by Woody Guthrie.

Listen to Woody Guthrie's 1940 concept album about agricultural and economic destruction, 'Dust Bowl Ballads.'

Bob Dylan considered Woody Guthrie a foundational influence, a sentiment he immortalized in his 1962 recording 'Song to Woody.'

Watch Bruce Springsteen's 1985 performance of Woody Guthrie's 'This Land Is Your Land,' which he calls 'the greatest song ever written about America.'

Woody Guthrie wrote 'This Land Is Your Land' as a sarcastic response to 'God Bless America.'

Before he was known as a folk singer, Woody Guthrie was a popular radio host in Los Angeles.

The FBI tracked Woody Guthrie's politics for years, amassing an enormous file that was only discovered many years after his death.

Woody Guthrie wrote an erotic ode to Ingrid Bergman, which was unearthed years later by Guthrie's daughter.

Woody Guthrie emblazoned 'This machine kills fascists' on his guitar, a phrase he borrowed from war machinery.

Billie Holiday's label refused to release 'Strange Fruit,' a protest song about lynching, because of fears of negative reactions from southern retailers.

Eddie Vedder's humble gas-station attendant roots

The singer was living in the San Diego area when a friend mailed him a demo tape recorded by Jeff Ament and Stone Gossard that lacked vocals. Vedder wrote lyrics for the three songs (one of which would later become the hit "Alive") and tracked his own vocals on the tape, then mailed it back to the band. Two weeks later, they invited him to move to Seattle to join the band.

Listen to the 'Deep Six' compilation, one of the first collections of grunge

In the '80s, "grunge" was still not a widely used term, though there was a distinct sound coming from Seattle, one that blended punk and metal. C/Z Records decided to document the emerging sound in 1985 by releasing a compilation with six of the city's cutting-edge bands, including Green River, Melvins, and Soundgarden.

'Over the Rainbow' became a widely covered standard

Judy Garland’s original 1939 version won the Academy Award for best original song, though it never appeared on the Billboard pop singles chart (which didn’t appear until 1940). Twenty different versions of the song by other artists—including Willie Nelson, Patti LaBelle, and Israel "Iz" Kamakawiwo'ole—have appeared on numerous Billboard charts.

'Blowin' in the Wind' became a rallying cry for the Civil Rights Movement

The song is based on a spiritual titled "Many Thousand Gone," whose melody Dylan reworked. The result was popularized by the folk trio Peter, Paul, and Mary and from there became an anthem for the growing Civil Rights Movement, culminating in Dylan's appearance at the March on Washington.

Dylan's early records were socially conscious folk songs

Dylan's early records were modeled after his heroes Woody Guthrie and Pete Seeger, meaning they were often acoustic numbers filled with lyrical wordplay and political themes. "Masters of War," from 1963's "The Freewheelin' Bob Dylan," is a perfect example of the form, railing against politicians and war profiteers.

Why Neil Young is sometimes called 'the godfather of grunge'

The legendary singer-songwriter's work with his band Crazy Horse, especially "Rust Never Sleeps" and "Ragged Glory," married infectious melodies with overpowering guitars, a formula that many grunge acts would replicate. Young would go on to perform with Pearl Jam (like in the performance of "Rockin' in the Free World" below) and record the 1995 album "Mirror Ball" with them.

EY 'Yip' Harburg is the lyricist behind 'The Wizard of Oz'

The 1939 film’s songs were written by composer Harold Arlen and lyricist EY “Yip” Harburg. In an early draft of "Over the Rainbow," the movie's most famous song, Harburg scribbled "Some day I’ll wish upon a star + wake + find the darkness far behind me,” which would eventually become the iconic line, “Some day I’ll wish upon a star and wake up where the clouds are far behind me.”

Rockwell's 'Four Freedoms' raised millions for the US war effort

Rockwell initially pitched the "Four Freedoms" project to the US Ordnance Department, but was rejected. Rockwell's editor at the Saturday Evening Post, however, loved the idea and published the images across four consecutive issues. After they became a sensation, the Saturday Evening Post partnered with the US Department of the Treasury to send the paintings on a 16-date national tour, which raised $133M in war bonds and stamps. Meanwhile, the Office of War Information printed four million sets of the posters with "Buy War Bonds" emblazoned on them.

The movie soundtrack that helped mainstream grunge

Cameron Crowe's 1992 film "Singles" coincided with the mainstream grunge explosion. The romantic comedy takes place in Seattle's music scene, making it a perfect Hollywood product for the time. It also featured cameos from some of the scene's stars, including Pearl Jam's Eddie Vedder and Soundgarden's Chris Cornell.

The story behind Copland and Graham's 'Appalachian Spring'

The ballet, which premiered in 1944, was conceived by the composer and choreographer through the mail, with the two corresponding about how the music might fit the dancing. Later, designer Isamu Noguchi would design a set that whittled the western Pennsylvanian pioneer town down to its core elements.

Dylan's raucous 1976 tour was one piece of an ongoing reinvention

In the mid-70s, Dylan assembled a ragtag group of musicians and poets—including Joni Mitchell, Joan Baez, and Allen Ginsberg—he called the Rolling Thunder Revue. Rather than playing stadiums in major markets, they played smaller venues in smaller cities for a more intimate experience. The tour yielded some of the most exuberant versions of Dylan songs, captured in this 1976 performance in Fort Collins, which originally aired on NBC as “Hard Rain.”

Once whale songs were discovered, conservation efforts boomed

Until the 1950s, humans believed whales were mute. Once American underwater surveillance systems caught their sounds during the Cold War, the perception of the creatures changed, leading humans to campaign for whaling bans and long-term conservation efforts. These captivating whale songs can be heard throughout the ocean.

The iconic national park posters were created by New Deal artists hired through FDR's Works Progress Administration in the 1930s.

Woody Guthrie was briefly a member of the Communist Party USA, but he was kicked out for 'lack of discipline.'

He signed to Columbia Records in 1972

Springsteen had been performing solo at various venues, including some famous folk spots in Greenwich Village. Columbia executives saw this performance of “Growing Up”—which would later appear on his first album, “Greetings from Asbury Park, NJ”—and invited him to formally audition for the label before signing him.

During the Great Depression, the US government used photography to document rural poverty.

Dylan opened for Martin Luther King Jr. at the March on Washington

The apex of Dylan’s era as a “protest singer” was his appearance, alongside collaborator and sometimes-lover Joan Baez, at the March on Washington for Jobs and Freedom. It was the same demonstration where Martin Luther King Jr. delivered his “I Have a Dream” speech. Dylan performed four songs, including a scathing version of “Only a Pawn in Their Game,” a ballad about Medgar Evers, an activist who was murdered at his home in Mississippi by a white supremacist.

Reports of a recording of Whitman's voice are said to be a hoax

A recording of Whitman reading a portion of his poem "America" has been mass-produced and broadcast, but the Library of Congress and other scholars say the recording is a hoax.

1982's ‘Nebraska’ was recorded alone at home, a rarity at the time for a major artist

“Born to Run” became a hit in part due to its massive sound, something that was only possible thanks to the magic of the studio. That continued with 1980’s “The River,” which gave Springsteen his first top 10 single. With “Nebraska,” though, Springsteen abandoned the studio, opting to release the spare recordings he made at home, by himself. At the time, such a decision was a rarity for a platinum artist.

The poem behind 'Strange Fruit'

"Bitter Fruit" was written by Abel Meeropol, a teacher, under the pseudonym Lewis Allen, after seeing a photograph of a lynching. Eventually, he set the words to music, and the song was then performed by his wife and other singers. In 1938, he played it for Holiday, who began performing it at the New York's Cafe Society. (Some users may experience a paywall.)

A comprehensive list of the best Bob Dylan covers

Bob Dylan’s songwriting quickly became part of the great American songbook, thanks in large part to many major artists of the '60s popularizing their own versions of his songs. As this list proves, though, that tradition continued all the way to today. Learn about essential covers of Dylan songs by Adele, Guns N’ Roses, The White Stripes, and others.

According to Kurt Cobain, Wipers invented grunge

Wipers began in Portland, Oregon in 1977, playing a form of punk rock that sounded darker and heavier than their contemporaries in New York, California, and England. The band remained an underground secret for years, influencing countless artists, including Nirvana's Kurt Cobain. "What more can I say about them?" he said in an interview. "They started Seattle grunge rock in Portland, 1977."

How the Vietnam War changed rock 'n' roll

This short video essay analyzes how rock music responded to US involvement in Vietnam, from the protest folk of Phil Ochs and Bob Dylan to the popularity of rock and soul records with soldiers stationed abroad.

The US lacked a national anthem for the first 8 Olympics, with 'The Star-Spangled Banner' technically an unofficial anthem until 1931.

Walt Whitman wrote a poem for the official celebration of America's 100th anniversary, but was not invited to read at the event.

​​The US government documented the forced removal of Japanese Americans in an attempt to garner support for the program.

'Show Boat' redefined the American musical

The 1927 musical—penned by Oscar Hammerstein II, who would go on to create, with Richard Rodgers, other titanic shows like "Oklahoma!" and "Carousel"—used its songs to advance the plot and build character rather than simply entertain.

After Warner Bros signed him at 18, Prince wrote a song to thank them

The label scooped the young artist in 1977, eager to ink a deal with the promising young savant. In response, Prince wrote a song called "I Hope We Can Work It Out," which suggested together they'd make "Music for the young and old, music bound to be gold." An official recording of the song was never released, but the Minnesota Historical Society acquired the original handwritten lyrics in 2017. You can see them below.

Watch a performance of the influential ballet 'Appalachian Spring,' with music by Aaron Copland and choreography by Martha Graham.