I agree with GUEST Russ that the bajo-playing problems are a bit of a side issue.The thing that needs explaining is why did the fiddlers stop playing jigs. All fiddlers (English scottish irish or welsh) going to america pre 1900 will have been carrying loads of jigs, American dance bands in the same period were playing jigs, yet by the time we get to the recording heyday of old time folkmusic the jig does seem to have largely vanished from mainstream american folk music. But everybody still knew old English favourites like Soldiers Joy. Where did the jigs go? It cant just be the lack of dancers, loads of people play jigs for pleaure on this (east) side of the atlantic, whether they ever play for dancing or not.I can't think of a reason, it's abit of a mystery.One element I can think of: as a guitarist, I know its more difficult to develop a driving accompaniment in jigtime. Perhaps the fiddlers did find they werent getting the support they would like from the banjo and guitarplayers who were becming important in the bands.at the time. It's notable,also, that in english and irish circles nowadays its easier towhip up a storm in reel/polka time. Jigs and hornpipes are more reflective. If you want to make an instant impression on a drunken pub fullof people, or a roving record company researcher, you'll go for the reel, everytime.