You may not like polka music, or old time music in general, but I gotta call out Ted Lange here as one of the hardest working accordionists in internet land. They have a TON of music in their weekly variety show list on youtube.
Anyway, what is of interest here is his amazing fluency with fills, and the bellows shake accompaniment (2:20) style:
Anyway, what is of interest here is his amazing fluency with fills, and the bellows shake accompaniment (2:20) style: