An example is the solo from Supersonic by Oasis, which is very, very similar to that from My Sweet Lord by George Harrison. The solo from Comedown by Bush, sounds like that from Nirvana’s In Bloom. Sort of. Do we have any other examples?
On the Rascals' 15-minute jam called "Cute" (which fills Side 4 of their Freedom Suite album), Gene Cornish played a guitar solo that contained a lick that he recycled one album later on the hit title song from See.
This solo has always amused me, as it's an homage to (in order) Chuck Berry, The Byrds, and The Move (!)
Steve Miller made a career out of plagiarising himself. His famous riff on 'Fly Like An Eagle' is almost a note for note lift off his earlier song 'My Dark Hour.'
How about an organ solo that's similar to a guitar solo? The organ solo in Continental Drifters' version of Gram Parsons' A Song For You starts out pretty close to the guitar solo from Badfinger's No Matter What. Starts at 2:24.
Jimi Hendrix - Are You Experienced Backwards Guitar solo Eric Johnson - Are You Experienced Played Jimi's backwards playback solo live!
Parts of the solo on this one are ripped off virtually note-for-note from Jeff Beck's solo on The Yardbirds' "Mister You're a Better Man Than I." Still a great song, though!