"...and he played piano and banjo in various outfits". That's where the story ended yesterday, and regrettably there's not so very much to add to it. The earliest, previously-unpublished pictures of Ian Stewart as a young musician, unearthed by William Nash for his book Stu (I haven't seen them yet!) show him looking pretty cool behind shades, strumming a banjo in a ribbed sweatshirt and slacks. The solid skin is determinedly Scottish.
Jack Bruce, Cream's bass-playing powerhouse from Pollock, Glasgow, says: "Stu should have been the lead singer of the Stones. And playing the banjo, I mean, what can be hipper than that?". Bruce may be biased. As a teenager, he also played boogie-woogie piano as a means of attracting girls: "That was what you had to do if you were a short Scot".
Source: Scotland On Sunday, April 16, 2004.