This isn't anything special. As the title suggests, it's simply a music pack. This replaces a majority of SRB2's music with themes from Jazz 2 and 3. The games have a great soundtrack that really fits with SRB2's stages. I suggest you give it a try.
Unfortunately, your attachments system doesn't want to accept my file, so I had to upload it here.
http://www.sendspace.com/file/itjn74