1. The incomparable solo by Ian Bairnson at the end of Kate Bush's Wuthering Heights of 1978. By the end of this one the amplifier was up to 11.
2. Rick Kemp's bass improvisations at the end of Elf Call by Steeleye Span, on their 1975 album Commoner's Crown.
3. (Controversially, no doubt - but I stand by it) Francis Rossi's simple but lyrical solo at the end of Status Quo's 1981 single Rock and Roll.