Do they have a good selection of oldies

I agree, call first. They have found music for me if they don't have it on hand

Depends on your definition of oldies. They will have a lot of reissues on vinyl of the biggest albums from 1980 and back, you might get lucky on a used record having been brought in, or if you're looking for CDs they have a good swathe of the essentials. If you're looking for a specific album it might pay to call first.

Maybe Beatles or cream