I don't have any music in my iPad's iTunes library. Nor do I have any on my iPhone, or any on my iPad nano (which I use exclusively for the Nike+ functionality).
Now, given those facts, you might think I don't really care for music. Actually, I'm an avid fan of several genres of music, and have more than 300 gigabytes of FLAC, AAC and MP3 files on my Drobo drive.
Guess I need to take my music out with me more often, though! 😀