After a fair amount of anticipation, Electronic Arts has released its Rock Band [App Store, $9.99] music game for the iPhone and iPod touch handsets. According to iLounge, Rock Band for iPhone and iPod touch has players attempting to time up taps on a set of four virtual picks or drum pads to a cascade of corresponding notes that fall vertically down the screen, or sing along to notes that travel horizontally from right to left, depending on whether the player chooses guitar, bass, drums, or vocals.