In their career, the British rock band Led Zeppelin recorded many songs that consisted, in whole or part, of pre-existing songs, melodies, or lyrics.
They sometimes credited those sources, sometimes not. This was common practice in the blues music world that influenced Led Zeppelin.
The band has been sued a number of times over attribution, some cases having concluded with others being awarded writing credit for the song in question.
List of Led Zeppelin Songs Written or Inspired by Others
Led Zeppelin song: Babe I'm Gonna Leave You 
Original Attribution Jimmy Page
Earlier Version: Babe I'm Gonna Leave You
Earlier Artist Joan Baez
Current Attribution Anne Bredon, Jimmy Page, Robert Plant
Led Zeppelin song: You Shook Me
Original Attribution Willie Dixon
Earlier Version: You Shook Me
Earlier Artist Muddy Waters
Current Attribution Unchanged
Led Zeppelin song: Dazed and Confused
Original Attribution Jimmy Page
Earlier Version: Dazed and Confused
Earlier Artist Jake Holmes
Current Attribution Jimmy Page inspired by Jake Holmes
Led Zeppelin song: Black Mountain Side
Original Attribution Jimmy Page
Earlier Version: Down by Blackwaterside
Earlier Artist Bert Jansch
Current Attribution Unchanged
Led Zeppelin song: I Can't Quit You Baby
Original Attribution Willie Dixon
Earlier Version: I Can't Quit You Baby
Earlier Artist Otis Rush
Current Attribution Unchanged
Led Zeppelin song: Whole Lotta Love
Original Attribution John Bonham, John Paul Jones, Jimmy Page, Robert Plant
Earlier Version: You Need Love
Earlier Artist Willie Dixon
Current Attribution John Bonham, John Paul Jones, Jimmy Page, Robert Plant
Led Zeppelin song: The Lemon Song
Original Attribution John Bonham, John Paul Jones, Jimmy Page, Robert Plant
Earlier Version: Killing Floor
Earlier Artist Howlin' Wolf (Chester Arthur Burnett)
Current Attribution John Bonham, John Paul Jones, Jimmy Page, Robert Plant
Led Zeppelin song: Bring it On Home
Original Attribution Jimmy Page, Robert Plant
Earlier Version: Bring It On Home
Earlier Artist Sonny Boy Williamson
Current Attribution Willie Dixon
Led Zeppelin song: Since I've Been Loving You
Original Attribution John Paul Jones, Jimmy Page, Robert Plant
Earlier Version: Never
Earlier Artist Moby Grape
Current Attribution Unchanged
Led Zeppelin song: Gallows Pole
Original Attribution Jimmy Page, Robert Plant
Earlier Version: Gallows Pole
Earlier Artist Fred Gerlach
Current Attribution Unchanged
Led Zeppelin song: Bron-Y-Aur Stomp
Original Attribution John Paul Jones, Jimmy Page, Robert Plant
Earlier Version: The Waggoner's Lad
Earlier Artist Bert Jansch
Current Attribution Unchanged
Led Zeppelin song: Hats Off to (Roy) Harper
Original Attribution arranged by Charles Obscure a.k.a. Jimmy Page
Earlier Version: Shake “Em On Down”
Earlier Artist Booker (Bukka) White
Current Attribution Unchanged
Led Zeppelin song: Stairway to Heaven
Original Attribution Jimmy Page, Robert Plant
Earlier Version: Taurus
Earlier Artist Spirit (band)
Current Attribution Unchanged
Led Zeppelin song: When the Levee Breaks
Original Attribution Memphis Minnie, John Bonham, John Paul Jones, Jimmy Page, Robert Plant
Earlier Version: When the Levee Breaks
Earlier Artist Kansas Joe McCoy, Memphis Minnie
Current Attribution Unchanged
Led Zeppelin song: Custard Pie
Original Attribution Jimmy Page, Robert Plant
Earlier Version: Drop Down Mama
Earlier Artist Sleepy John Estes
Current Attribution Unchanged
Led Zeppelin song: In My Time Of Dying
Original Attribution John Bonham, John Paul Jones, Jimmy Page, Robert Plant
Earlier Version: In My Time Of Dying / Jesus Make Up My Dying Bed
Earlier Artist Blind Willie Johnson
Current Attribution Unchanged
Led Zeppelin song: Trampled Under Foot
Original Attribution John Paul Jones, Jimmy Page, Robert Plant
Earlier Version: Terraplane Blues
Earlier Artist Robert Johnson
Current Attribution Unchanged
Led Zeppelin song: Boogie with Stu
Original Attribution John Bonham, John Paul Jones, Jimmy Page, Robert Plant, Ian Stewart, Mrs Valens
Earlier Version: Ooh! My Head
Earlier Artist Ritchie Valens
Current Attribution Unchanged
Led Zeppelin song: Nobody's Fault but Mine
Original Attribution Jimmy Page, Robert Plant
Earlier Version: It's Nobody's Fault but Mine
Earlier Artist Blind Willie Johnson
Current Attribution Unchanged
