Twitter's #music arrives to the iPhone with the potential to streamline music consumption within the Twitter ecosystem by focusing on habits that have slowly developed during the service's seven-year existence. In this regard, the much-ballyhooed app succeeds by taking a simple, list-based approach to song selection, while simultaneously giving fans both instant access to artists on Twitter and the ability to discover new music through those artists. But Twitter's #music is as much about listening as it is discovery.

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