At the time of writing, the Twitter #music app is the 127th most popular free music app in Apple’s US App Store, rubbing shoulders with the likes of Epic Drum Set, Cat Piano and Ringtone Maker Free. Ouch. The iPhone app’s initial burst of downloads has dwindled, but Twitter is continuing to roll out features for the web version of the service. Yesterday it launched a bunch of new charts on the Twitter #music website: Superstars, Unearthed and Hunted – the latter being “popular music on blogs” – to sit alongside the existing Popular and Emerging rankings, as well as lists for genres like alternative, dance, folk, metal etc. As before, full tracks can be played by Spotify and Rdio subscribers, with iTunes clips for everyone else. The Hunted chart is a welcome inclusion, expanding Twitter #music’s discovery beyond simply what’s popular on Twitter: something that We Are Hunted specialised at before the startup was bought by Twitter to power the new service.