Verified answer

David Gilmour's Comfortably Numb solo.

Also, Eric Clapton played the Gently Weeps solo, not Harrison.

George Harrison's in While My Guitar Gently Weeps by the Beatles :)

Bohemian Rhapsody!

Down By the River - Neil Young

Gosh, there are so many. Quite a few of Frank Zappa's; maybe the one on the live version of Stevie's Spanking would be the best.

The Beatles-Taxman or Pink Floyd-Dogs

it's really hard to chose

Kate Bush - Wuthering Heights. I am not sure who played it, but she wrote it.

Cemetery Gates- Pantera.