Becky in Tucson has listed many of the ones I'd have listed.
(As a contra dance caller in central NY... and dance gypsy all around
the Northeast US coast... I get to hear tons)
There are a large number of young (under 25, some under 20 year olds)
musicians out there carrying on the tradition and moving it forward.
Old "Popcorn Behaviour" recordings are great.
I'd also point you in the direction of the VanNorstrand brothers of central NY. With their mom they're knows as the Great Bear Trio, and
have three CDs to their credit even though Andrew's only been old enough to drive for two years. (Drive age =16 in the USA). Great stuff!