Agree with Ethel, it is VERY unsafe.
When you download files from limewire you are actually downloading them from someone elses computer (an ordinairy home PC like yours or mine).
The problem is, as Ethel says, is that you have no idea WHOSE PC you are downloading a file from, and if they can be trusted. It could be someone in Russia, South America, Japan, you have no idea.
You also have no idea if the file you are downloading is actually a song, or a program than is going to be run on your PC and install a virus.
For example, I may have a song on my PC called
myway_franksinatra.mp3
The letters at the end "mp3" denote it is a song, so it should be OK.
But some people "hide" virus programs "inside" the name of a song.
So they may create a virus file called
myway_franksinatra_this_is_the_live_version_in_las_vegas..................mp3.........exe
Now a quick glance shows "mp3" near the end so you think it is a song, but if you look at the very end it says "exe".
Now an "exe" is a program, and you may not even notice that.
You download it, double click on it to play the song, and BANG, the program runs and you have a virus on your PC.
As well as "exe" at the end it could also be "scr", "dll" or other letters, they are all programs.
If you are VERY VERY careful with what you download, and check each file is a genuine mp3 (or similar) file before playing it you MAY be OK, but do you want to risk it?
There are some nasty people out there who just love to wrekc other peoples computers (for some reason).