Chances are the files your trying to d/l are fake and if you read through this thread it has all the tips to help you find the files your looking for:
How to find music 
.
If they're rare files then have patience and eventually you'll find them. Try searching at different times of the day. As different hosts log on you'll get different results. Vary your searches up. Search for just the name of the artist or band, or just keywords from the title and not the whole title ect.