The Five Spot, Philadelphia
The theme is definitely old school, 1920s or 1950s, sometimes it's hard to tell. They have good stiff drinks that I personally associate with those days . . . highballs, martinis, etc. On Tuesdays through Sundays, the music is live and swinging. Big Band, Latin and Swing. Dance like you mean it, baby.
If you can't dance (I feel your pain, why not learn? On Thursdays they offer Latin dance lessons and on Sunday nights you can learn how to swing (and shake that thing).