Everybody, everybody knows Led Zeppelin's signature song "Stairway to Heaven".
Now, all these years later, a band called Spirit, who were around recording back in those days, say Led Zeppelin stole their song.
The two bands played a few gigs together way back when, and years later Led Zep even did a medley of four of Spirit's song from time to time live onstage.
Well, we found the song they claim was plagiarized. Give it a listen:
(btw~ you'll really see why they claim they were ripped off at around :50 sec into the song)
You can read more here.