I'm a big Zune person (LOVE my Zune HD...and the Zune Pass can't be beat!) and it goes everywhere with me, so I keep very little music on my iPad (and I use it with Planetary). However, I DO listen to music on my iPad, usually via Pandora, AccuRadio and Aweditorium. The latter is an excellent way to discover new acts.
Michael "Spam, spam, bacon, eggs and spam. Hold the bacon and eggs." Sent from my iPad 2 using iPF