[maltaille]

The first 30 seconds - one fifth of the song - of Little Wing, by Jimi Hendrix
The intro to Gimme Shelter, by The Rolling Stones
The intro to 2000 Light Years from Home, by The Rolling Stones (especially the live version from the 1990 Madrid concert)
The intro to the Nina Simone version of Summertime
The interlude in Sinnerman, by Nina Simone
The intro to Locomotive Breath, by Jethro Tull (especially live, they do it several ways)
The intro to Money for Nothing, by Dire Straits
The Brian Eno/Phillip Glass/David Bowie version of Heroes
The intro to the extended version of Papa was a Rolling Stone, by The Temptations
Half a dozen Nine Inch Nails songs, like La Mer, Memorabilia, Slipping Away, or Ripe (With Decay)

Does the chanting in O Fortuna make the rest of it count as the instrumental part or a song?

Award for best riff: shared by Rocky Mountain Way, by Joe Walsh, Kashmir, by Led Zeppelin, and No One Knows, by Queens of the Stone Age