Just a few years ago, the world seemed full of promise — there were music hack days everywhere you turned, big music tech conferences once every few months, and startups without revenue models were pulling in millions in VC funding. A quick glance at the 2013 MIDEM “30 music startups to watch” list reveals many have met a sad fate — 18 of the 30 no longer seem to exist at all. Others still have a web presence but haven’t posted anything new in years, or are zombie startups running out the clock, or never ev