"Knockin' On Heaven's Door" has been recorded dozens of times as folk music, hard rock, hip-hop and reggae.

NPR: Dylan's Legacy Keeps Growing, Cover By Cover

He blends rock, folk, blues and classically influenced music into a boundary-defying style that has won him a devoted following all over the world.

NPR: Alejandro Escovedo: Defying Boundaries

Los Lobos loves to jam and mash together musical styles putting a new twist on Mexican folk music, sometimes combining it with rock 'n' roll.

NPR: Los Lobos In Concert

The music is moving toward a folk-rock sound of the 1960s and 1970s.

FORBES: The Religious Left Returns

Landau grew up on folk music, and in high school he went to every rock concert he could afford.

NEWYORKER: We Are Alive

Songwriter Vic Chesnutt has often been called gifted, but his music a spare, introspective and idiosyncratic brand of alternative folk rock is decidedly non-commercial.

NPR: Vic Chesnutt, Live in Studio 4A

With 550 ticketed and 200 free shows a year, WCL hosts live music in just about every genre, including jazz, rock, folk and rap (Philly native Queena Marie stopped by in early January 2012).

BBC: Philadelphia��s musical roots

Merritt's music is hard to pin down: She incorporates gospel, soul, '70s California rock 'n' roll and warm echoes of Joni Mitchell's brand of folk music into her piano-based country songs.

NPR: Tift Merritt: Newport Folk Festival 2009