Probably just award the 1970's the Long Song Award.
Lily, Rosemary and the Jack of Hearts, 1975
Lily, Rosemary and the Jack of Hearts, 1975
Two of my favorite long songs are Layla and Rosalita. However, they are only a little over seven minutes long. You set that 8 minute limit on purpose so that I couldn't mention those two, didn't you?