“Charlie, please do not write anything that sounds negative!!”
I wasn’t trying to be negative, I was just trying to understand what you meant. “Jewish” music is really hard to define. Almost all Jewish music has been influenced by non-Jewish styles, and I don’t think Arnold Schoenberg’s atonal music, which arguably was like nothing ever heard before, is what any band is going to play at a simcha.
When my wife and I got married we hired the best klezmer band we could find. We wanted something that was more of a traditional Ashkenazic Jewish style even though that style is arguably only about a century or two old and clearly shares characteristics with other Eastern European music. We also were successful in getting them to keep the volume at a reasonable level, which our guests appreciated.