From the blog post: "You can download Twitter #music from the App Store today, or enjoy the web version, which will be rolling out over the next few hours: mus

From the blog post: "You can download Twitter #music from the App Store today, or enjoy the web version, which will be rolling out over the next few hours: music.twitter.com." So the web component will be rolling out later today. The app is available and working. Edit: It's now working for me https://music.twitter.com https://music.twitter.com