There are a lot of fake files around at the moment. Mostly new releases & very popular songs, with heaps of sources (up to 100). You're wasting your time with these, kill the download. Try to download a file with less than 10 sources, maybe cable/dsl or modem hosts. Use the All Types search rather than audio, search for artist or album rather than song title. This way, you might find some different results & some good sources

In your post you said "despite this I've been unable to download other songs"... is this a typo or can you really not download anything? Try going for an older song (a few years old) & see if you have the same trouble!