Since when did you 'have' to pay for it? LimeWire is FREE. And it's not a service.
Perhaps you accidentally paid for a scam version of LW; Known Scam Sites (click on link).

Not sure about Musicmatch, perhaps you are missing some needed codecs. You could try playing the same files in another audio player.

Keep in mind some spammed corrupt audio files: MAJOR TOPICS for Upload/Download HELP