I guess it depends also upon how you have trained your junk filter. If you trained it with some files that were in fact good, then you should remove all training & start again as it will give inaccurate results. To find music, see How to find music (click on link)
However, if you haven't trained the junk filter at all, then those files probably are garbage. Going elsewhere or stop using LW is exactly what the people who spam the network want you to do. Other networks get spammed too btw.

The culprits for spamming rubbish are these types or groups who are sponsored to do it: (a) Overpeers, (b) MediaSentry,
(c) Mediadefender