When listing other groups (Bobs, Rockapella, Nylons) I hadn't done any research.
Last Bobs album was in 2005 (not so bad), but only had 7 tracks on it (uh oh). Granted - it was "Rhapsody in Bob" (cool) but the album clocks in at 35 minutes (uh oh).
Rockapella's last was a live album (inexpensive) a few years ago, and this from a group that averaged a new album every year for a decade (uh oh).
The last 3 (!) Nylons albums have been compilations of unreleased material and rereleases of hits (triple uh oh). Their last album of original music was a decade ago (crikey!)
And so on.