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Concertina keys...
C/G
G/D
D/A
Bb/F

schlepporello wrote: Personally, I'd go with a keyboard accordion.

Right - I'm thinking, a helikon bass for you!

schlepporello wrote: Laugh now.
I almost bought one like that.

I've seen a couple in action - not that one, didn't notice the make but clearly high quality instruments, both the same. They get quite a sound. If one showed up on my doorstep, I wouldn't mail it back, but the diatonic thing isn't for me so much.

schlepporello wrote:http://www.youtube.com/watch?v=RDVrHqQk ... re=related" target="_blank

I see your video....and raise you....

http://www.youtube.com/watch?v=UpVOOmmQA5Q

schlepporello wrote: Yep, a local pawn shop had a few similar to the one you pictured that they were selling for $120 at the time.

Well, that picture was attached to a $1600 price tag. They're not all that expensive - most are more expensive, I believe. Rumor has it that behind each of those those ports on the left side, there really is a tiny little helical horn, that amplifies the excessively big bass reeds on these guys.