With regard to Neil Young, check out him playing on ‘Mirror Ball’ with Pearl Jam as well as ‘4 Way Street’ live album with Crosby, Stills and Nash.
Saw NY with Mirrorball at Reading in ’95. Still wear the tee shirts!
One of my all-time favourite guitar solos is an obscure one in a rather unlikely place; on an Alison Moyet single, Love Letters. There are two extra tracks on the CD single, Ne Me Quitte Pas, and This House, which ends with a really quite amazing, woozy solo, with lots of whammy bar note bending and echo. Sadly, the version that’s on her Greatest Hits is an edited version, without the solo, which is a terrible shame.
[edit] Apparently the cd is rather rare, it’s going for £22 on Amazon!