I like country music and love bluegrass music. Lester Flatt & Earl Scruggs are my favorites, closely followed by Bill Monroe.
Edit to add: I rarely drink, and when I do it's usually at home. I like to sit down with a frosty mug of Penn Dark (a German lager made in Pittsburgh) and listen to Tommy Makem and The Clancy Brothers (Irish folk music) and bluegrass. I always start with the Irish drinking songs though.