Both Valleywag and Silicon Alley Insider point out that one of the reasons Muxtape shut down probably wasn’t the R.I.A.A., but all the costs associated with running a massive streaming music database. One of the things I’ve noticed about Web 2.0 is that music content is seen as more of a liability than an asset when growing a business, as the Muxtape shutdown demonstrates. That is to say, there’s probably no bailout coming, at least not for Muxtape as we knew it. The bottom line is if you’re bullish on “music 2.0,” Muxtape’s situation should be a case study for anyone who’s trying to find the right niche for music online.