I recently bought the 2-DVD set of Cream's 2005 reunion gig at Royal Albert Hall (using a Christmas gift card).

Eric does a nice job singing and playing the T-Bone Walker slow-blues classic Stormy Monday, but I was also struck by one of the Cream originals from "back in the day" which was not exactly a traditional-format 12-bar blues, but nevertheless both (a) slow, and (b) undeniably The Blues in feeling and approach: Sleepy Time Time.

Terrific vocal by Jack Bruce, wildly creative guitar by Eric Clapton, plus of course the genius rhythmic underpinning provided by Ginger Baker.