I can see the legal problems, However...

this 'app' is much more than originally intended. i am starting a band and already I can use this in performance in some ways.

what seems the Next Step might be modular programs, client server is one style, where I can have MY OWN lyrics what I wrote myself in sync with the playback.

it is absurd that each band member needs two or more iPods. even one each, we need just a synch signal bar by bar somehow- then lyrics on another iPod follow the main playback, the sax has Bb chords but I have normal, and the set list needs to be linked too. with zero multitasking on iPod iPad etc... the cure would be time codes, like MIDI?