Some say "Stairway" sounds a lot like "Taurus" a song by Spirit, which claims performing on 1960's tour with Zeppelin.
Read, listen and decide. You be the judge.
ZEP
The Kennedy Center Honors Led Zeppelin 2012 https://youtu.be/ra-itTKnFaw
Jimmy Page: How Stairway to Heaven was written - BBC News https://youtu.be/DDo4CA13LbY
Spirit and Stairway To Heaven https://youtu.be/o2PgBak2Ed4
Led Zeppelin to face trial over 'Stairway to Heaven' http://fw.to/WJBRSiL
Led Zeppelin are not thieves: “Stairway to Heaven” fight rests on a nearly impossible copyright standard http://www.salon.com/2016/04/17/led_zeppelin_are_not_thieves_stairway_t… via @Salon
COPY CATS
Surviving members of Led Zeppelin to face jury trial for "Stairway to Heaven" copyright suit http://abcn.ws/22sRs25
The Kennedy Center Honors Led Zeppelin 2012 https://youtu.be/ra-itTKnFaw via @YouTube