It’s not just Spotify whose mobile API is the base for interesting new music apps. Anthm is a new iPhone app from US developer App Empire which promises to “turn your iPhone into the next generation of jukebox”. It’s powered by Rdio – in fact, its full title is “Anthm – Powered by Rdio” just to hammer the point home – and is aimed at providing a collaborative, dynamic playlist for parties. “Launch the app, start a party then you and your friends can add music into one playlist,” explains its App Store description. “Unlike a jukebox, everyone can vote songs UP to hear them sooner and vote them DOWN to move them down the playlist. HEADS UP, the host (and only the host) of the party will need an Rdio account (where the music comes from).” The app is a free download.