Sophie44,
Bitrate just refers to how much a song has been compressed. The more it's compressed, the lower the bitrate and the lower the quality. eg a 5 minute song with a bitrate of 192 might be 4500 KB. The same song with a bitrate of 128 might be 3300KB (128 is roughly CD quality).
Why the network has so many of these fakes around?? In some cases - just to sabotage P2P, in other cases - to spread spam or worse.
All I can suggest is to keep on searching & don't forget that heaps of hosts are in different time zones, so try serching at different times of the day. You'll probably find that you get different results depending on when you search.
You could also try searching for the album, rather than song or artist...sometimes this works.
Good luck!