How many hours of music do you have on your device(s)?
Right now I have 4 hours 55 minutes worth of music on my Evo 4G LTE, across 41 songs and taking up 614MB of storage. It's split about 50/50 between 256kbps and 320kbps MP3s.
It's about the same on my computer (though including the sample Windows 7 songs it's closer to about 5:15).
How much music do you have on your device?
EDIT: I should say local music. You probably have several hundred years' worth on Spotify/Rdio.
EDIT 2: Spotify has ~160 years worth of music (they have ~20 million songs, and assuming an average song length of 4 minutes). The more you know...