My favorite version is Mountain's at Woodstock with Felix Papallardi on vocals. Felix produced Jack Bruce's album that this song first appears on- Songs for a Tailor. I don't know how you feel it sounds anything remotely like Cream in this song and especially if you listen to Jack's version on Songs for a Tailor. The only likeness to Cream is that some of the Cream songs attributed to Bruce were in collaboration with Pete Brown's lyrics. Sunshine of your Love, Politician, SWABLR, White Room, on and on were lyrics by Pete Brown. Jack Bruce's forte was composition and his music was/is wonderful and beautiful. Yet, heavy-duty trio versus Jack Bruce on piano singing this song? I would love to hear Clapton do a version, but even though it belongs to Bruce, Leslie West from Mountain pretty much made it his own.