there is a series of books that helps creative people get published...
THE ARTIST'S MARKET
THE WRITER'S MARKET
THE CARTOONISTS MARKET
THE MUSICIAN'S MARKET
etc

they consist of nothing but contact information for publishers who pay for creative content. Typically they also include hints on how to present work to the different places, since the New Yorker prefers a different type of cartoon than Penthouse for example.

It would be awesome if there were regional versions of information with contact info for venues that hire live music. Those of you who book your own bands, put that idea in the back of your thinking. When you get to the point where you don't want to perform anymore, you may be able to sell such contact lists to up & coming bands who have talent but no gigs.

Around here there are free weekly newspapers that are typically in racks outside supermarkets and restaurants. They advertise the arts, including the local live music scene. I've been going through them every week laboriously creating call lists of places that offer live music, but I wish there was an easier way.