See, with this, you didn't even bother to make them loop.
In my mod (Capture the Hotel), I do use bits and pieces of music from Audition for the elevators, but only bits and pieces (maybe 20 seconds for one of them), and they loop perfectly. (OGG format (very small file size for each piece))
What you did, was blatantly insert random MP3s into a wad as music lumps, and didn't even fix them in any way. Oh, and by the way, this is illegal. You could be charged/fined for every single illegal MP3 (freely downloaded on Limewire, Kazaa, Napster, etc.) at any time (if that music patent company catches you, anyway).
So, guess what? You're breaking the law. Good job dude, good job.