Hi Bonnie,Welcome to the world of 'old timey' music. Around here, (practically the center of the old timey universe) they play fast and hard. At sessions where 'old timey' predominates, the pieces all start to sound the same after a while.
Good luck finding old timey sessions that aren't that way. If you're ever in the Shepherdstown/Martinsburg area, we have a couple of sessions where you would fit right in if you like to play both fast and slow.
As for my own repetoir, even though I play the accordion, what I do is have a small handfull of pieces that I play with richness and depth. And I try to have several that I know less well and play with little or no richness or depth because I know that as I play them more I'll grow into them.
Take care,
Carol