“Sunshine of Your Love,” Cream

Eric Clapton and Jack Bruce had reportedly just come back from seeing Jimi Hendrix perform in London, when they set about crafting this riff-driven classic. “The way the song happened was the riff came first,” Bruce told Ultimate Guitar. “I just played the riff on the double bass. And then I knew that that had to become a song, but it took a while. Eric came up with the turnaround part. So that kind of got grafted on. We were just singing the riff, you know, a variation of the riff.”