>> it was really he playing on the Toronto recordings <<
Stu played piano on Worried Life Blues and Keith played it on the other tracks from the Toronto 77 sessions.
since those are often confused with the Longview Farm 81 tracks, which are all solo Keith on piano,
it's probably a good time to re-post [
www.studiowner.com] for anyone who hasn't seen it -
that's the start of the section about Keith's reconaissance mission, and includes some clips of him on piano,
but the whole site is well worth reading.