Ed,
Give us an example of one of the songs: What is the file size & the length of the song in min, sec.

They are probably compressed files in mp3 format or similar with a .wav extension. If you open them in an audio editor to see their parameters you will just see the 'before compression' figures.

If there is an example less than around 1MB email it to me at af@tpg.com.au.

Cheers,
Alan