How to Play Music
If you are using WorldsPlayer today, you can enable music by selecting Options > Music...> Check-mark Use BGM if CD is absent:
Worlds Ultimate 3D Chat Soundtrack
These are tracks found on the WorldsPlayer client since 1998.
Wirlaburla uploaded the tracks from the CD-ROM here.
Worlds Chat Japan
You can also find the music files for it in Wirlaburla's archive.
Music can be heard in this stream by Saint.
Worlds Chat Gold
These are tracks found on the Worlds Chat Gold client from 1994-1998.