This page contains music tracks pulled out of videogames. The tracks are encoded in standard mp3 format, which means that you won't need any special converters to be able to listen to them. All you need is an mp3 player program like Windows Media Player, WinAmp, etc.
Soul (the head admin) recorded some of these mp3s himself. Others were donated by kind visitors and forum members. Their name/screen name will either appear next to the individual song title which they donated, or above the whole listing, such as Yoshi's Island mp3s, all provided courtesy of JDyoshi.