I stand corrected it was a U67 and M47 on the piano. Thanks for the link, Steve, I forgot about that page.
To TomR, yes we hope to do one of our own recordings in each series. We have blast doing it, access to the best live room in San Francisco, and a couple of ideas for killer sessions in development.
Steveidosound, yes, some of the tracks, like Here's to Life, are straight takes. At the very least all other tracks were with all four artists playing in the tracking session. Obviously with Art playing three or four instruments in some tracks, those tracks had overdubs. Ditto with Josh on conga and bongos. I completely agree that getting the band to play together, and even better with an audience like was provided at my b'day party, you get the best out of the artists.
To Ben, oh yeah, if we did a session with the intention of only putting it out for TP subscribers the tapes would cost a fortune. Many tracks from The Number White session were also used on The Color Five CD, with different mixes. We recorded on tape and digital at the same time, so The Number White is from the tape and The Color Five CD is from the digitally recorded files.