Hi,
Just thought it might be handy to display a bigger part of the playing track's waveform, for example, when turning iPhone right or left so the screen is in "landscape" mode. Also more information can fit about currently playing track, or/and additional controls can be featured in this mode.
Also, when viewing Album/Artist list, it might be a good option to use the alternative view as well, when iPhone is turned right or left. More information can be then displayed about a particular album etc.
Andrejs