People always ask me why "Stairway to Heaven" sounds exactly like "Taurus", which was released two years earlier. I know Led Zeppelin also played "Fresh Garbage" in their live set. They opened up for us on their first American tour.
In May 2014 an attorney hired by Randy California's estate announced plans to file a copyright infringement suit that will seek a co-writing credit for California on "Stairway to Heaven." 
^Guitar World Magazine, April 1997: "(Randy) California's most enduring legacy may well be the fingerpicked acoustic theme of the song "Taurus," which Jimmy Page lifted virtually note for note for the introduction to "Stairway to Heaven."
^Sleeve notes, booklet included with CD EPC 485175