I actually saw Jack Bruce live in early nineties Israel, at a strange live show which I have attended under rather strange circumstances. Bruce seemed like he didn't really want to be there. Luckily, he sure seemed as if he's having a good time in the 2005 Cream reunion whose video I can watch again and again.
Although he's the person behind some big hits like Sunshine of Your Love (and its luring basic beat), my favourite piece of Jack Bruce music is actually in a piece credited to Cozy Powell; he "just" plays bass (and contributes a Cream theme at the end). A few decades back, this song used to serve as the theme for Israel Reshet Gimel radio's equivalent of Top of the Pops: