Twitter officially joined the crowded world of online music today with the launch of its Twitter Music app. The premise is to help users find music via Twitter in a few different ways—through the bands you follow, what's trending on the site, what your connections are listening to, etc., reports Good Morning America. For now, it will draw from Pandora, Spotify, and iTunes, the company says in a blog post. (Business Insider offers a run-through of how the app works. "It's gorgeous," writes Steve Kovach. It's available on iTunes, but Twitter says an Android version is on the way.) Some initial reactions: