#14 - like the use of the skyscrapers/decibal graphic, as it's quite straightforward but expresses the music point well. Would like it if the 'Let's Groove' font was less cartoon-ish. Also the purple cookie-cutter background isn't quite what we are after (as we need it to look more slick).
#13 is a bit busy. Maybe change the font to a more sophisticated, stylish font, and use less musical symbols/instruments. We need the logo to make the band look a bit more expensive, as they are an up-market act.