Hmmm, I'm wondering if it was the Commodore Ballroom my g/f and I went to every Friday night. It had two different bands; one on the main floor and the other on the second. Neither music interfered with the other - and in thinking about it I don't know how that worked but it did.
We'd go out for dinner and then dance the night away. OMG the fun we had. Can't remember the name of the venue tho' so if you remember what the Commodore was like, was this where I went? It was what, 50 years ago? Wow, how time flies!