I don't know about clubs, but at the label I work for, CD's are always the best way to submit music. A lot of folks just don't know how to do any sort of quality presentation of their mp3's. That, and the less work that has to be done, the better. Easier to pop a disc in a player than hunt down tracks online anytime.

A little late to reply, but as someone who books shows myself, I don't care whether I get a CD in the mail or MP3s by email. What I care about is that the recorded sound I hear matches the kind of sound I'm going to hear live. That means, I don't like studio-produced stuff unless it's a reflection of what the band actually does in person.

I also like to get bio stuff, jpegs i can send out with press releases, and most important, catchy phrases that sum up the sound of the band in a few words. I'm not looking for comparisons to other bands, I'm looking for descriptions such as "dark, junky circus music" (that's Iron & the Albatross, for instance), or "Indian-influenced chamber jazz" (the label I put on a quartet called Gojogo.

PS: Feel free to point me to websites, Tribe and MySpace pages, etc., but realize that I don't book rock (unless you replace the guitars with trombones or something), or singer/songwriter. I book, odd, quirky music and good old-fashioned brass bands.