Live music fans already have some excellent choices for listening to concerts on an iOS device: Archivist, which taps into the massive Live Music Archive, is one great option. The just-launched Spacebar app is another. Rather than serving up concert recordings, however, Spacebar lets you listen in on live shows as they happen. There's no archive here; once a concert is over, that's it. In fact, before you can even hit the play button you'll need to agree not to record, copy, or distribute the live...
