If by having an "iTunes" library you mean it has some old DRMd 128kbps AAC files, I believe they'll let you download non-DRMd 256kbps versions which will then play in most decent media players. AAC achieves transparency at lower bitrates than MP3, and compatibility really isn't much of a problem these days. Windows users seem to like foobar2000, MusicBee, or dBPowerAmp so you can move on from iTunes.