I've never understand it. I've been collecting/ripping mp3s (and then later oggs) ever since about '97. I've never need a tool to 'organise' my collection. Every OS I've ever used has had this really clever idea called the directory (or folder). It's quite simple really, I haev one top-level directory called 'Music' and inside I have an 'A' folder, a 'B' folder etc. etc. Inside I have (here's the clever bit) more directories eg. 'Ah-ha', with that I have directories for each album by the band.
Okay, I have one directory under 'M' called 'Misc' which is getting a bit large by hey-ho.
Oh and I own all those files, they're mine and I can copy them onto any device I own and share with friends should I want to.
Screw Apple and screw anybody that doesn't let me own my music collection and potentially pass it onto my children. Props to Amazon that allows me to buy DRM-free mp3's (along with the CD! awesome!)