Bennie Moten's Kansas City Orch, 07/17/1929. There is what sounds to me like either a pump organ or celesta. Or could it be an accordion? It doesn't really sound like an accordion, I don't think. The "Chronogical" people only list an "Ira 'Buster' Moten-pac-2nd p". "pac"? What is that thing I'm hearing?