One song was particularly fascinating: a primitive attempt at the new fangled sound called 'jazz' by a French country musette band from the early 20th C.
Crumb explained that when early American jazz bands went to Paris in the 1910s, the new sounds caused a sensation when they performed in the up-market venues. So the country bands were aware of the new style of jazz but most people had never actually heard any and had to play what they imagined jazz to be, mostly based off verbal descriptions. I remember this record as a crazy sound, but brilliantly entertaining.
Unfortunately I can't point you to the song or the interview, but if anyone else can please reply :-0