Gotta be Mick Ronsons Angel number 9 for me. The actual intro is awesome and he just makes the geetar howl at approx 3.20. No one else made a guitar sound like him. Sadly gone now. Stuart
Personally, Thin Lizzy for me, so many good ones and Gary Moore also Richie Blackmore, Deep Purple/Rainbow. So many out there hard to choose, also like a good drum solo Cozy Powell etc.
One of my favourite rifs is the intro on Once upon a time in the west by Dire Straits Also Don't fear the reaper by Blue Oyster Cult