I was clicking through the BikePedia stuff, and I'm thinking that the Rhumba, Samba, and Rock n Roll were all on the same frame, but had different components to the build.
Then there's Zydeco and Duet! Well, we're a musical family, so it's nice to have a musical bike!
Here we are last summer...
Update to the rebuild: got a seatpost at the shop. Riding the bike there seatless got some funny comments. So then I happened to be in town when the bike polo game was on, and dropped by with my still seatless Burley. I'd never been. They dug the bike. During a break, I grabbed a mallet and tried bike polo for the first time. On the tandem! The thing's still in pieces and I'm having fun with it!