Only six months after a very high-profile launch, Twitter #Music may very well be closing its doors. Although there was a lot of positive press generated around #Music’s launch, the target audience of mobile app users failed to materialize. Only nine days after its launch, Twitter #Music fell off the top 100 free apps in the iTunes store. It’s hardly even cracked the top 1500 overall apps, and it hasn’t been in that category since May. To contrast the success of the video-sharing app Vine, which sits at 15 out of all free apps, it’s a pale comparison, and a clear sign that it didn’t live up to its promise. What happens from here is anybody’s guess, but for Twitter to be ready to admit defeat is a big step back in the music space.