Technically nothing though I did play in other bands with many of the backing people from both the Aerial M era and Papa M era (Tony, Todd, and Tim).
The backstory is that Dave enjoyed my old band from that era. I think we had even played a show or two together. He had a commitment to open for Smog in Louisville and didn't want to play. I think he said if he bailed on any more shows he was worried his booking agent would bail on him, so he concocted the idea of my bandmate and I joining Papa M. However, the day of the show, Dave would mysteriously not show up, and we'd just play our normal set and get to open a big show with Smog. I was maybe 19 and was told to expect everything from Dave's rider which did not happen with the promoter. However, it was the start of a friendship with the promoter that led to me opening for Bill Callahan a few years ago on Derby or Oaks eve (can't recall) here in town. He just thought I had to play again after the odd memory from 1999 (I think).
So, no, I never played on any M stuff, never even practiced, but TECHNICALLY (doh!) I was in the band ha.