if you get lousy sound it is no fault of Limewire's. The files are downloaded directly fom the host and what you get is what they are sharing.
A bit of experimentation with files from different hosts and with different bitrates will help you decide what sounds good to you.
What are you playing the songs on? If you are using Limewires player you can expect pretty dreadful sound at the best of times. iTunes or another good media player will give you infinitely better sound.
Also et voil is one of the most helpful contributors to the forums and he and others who try to be helpful get frustrated by the number of poorly headed threads, with little information to go on, not to mention the legions of the scammed (don't ask.... if you are icurious do a search!)