Hey, I was looking for a good MP3 or OGG decoder that use the BSD license or public domain and that is also light-weight (something that comes with sources without the need of platform specific configuration).
You're not likely to find one for mp3 as there are a handful of licensing issues.
OGG is simply a container format that can hold audio, video, and more. Perhaps you mean ogg vorbis. Check out stb_vorbis. It's a free, public-domain C vorbis codec.