Here are a couple of the answers:
Did you let the person know - it is because it is a "hall" where we discuss the Kingdom - hence "Kingdom Hall" and NOT a "Dance Hall" or a "Music Hall"??
The purpose of our music is to worship Jehovah in song and the musical accompaniment is solely to help in that purpose.
Music should be done tastefully and not detracting from the style the brothers have chosen (avoiding the gospel style or the traditional catholic choir sound)
Had to stop reading after some of these comments, however I noted three pages of back and forth about drums.