This a very informative article that gives the basics of MIDI is. The webmaster claims to update these files frequently. Therefore, it's audience would be jazz enthusiasts. The links will be active for 24 hours. In this site, after you download the specific software, you can actually download specific pop songs or album from the site so the person can sing a song with the pre-recorded MIDI accompaniment. This entire site has been upgraded recently. All of the melodies are royalty free but can only be used according to the license agreement included in the pack.
Each MIDI command has a specific byte sequence.
The Unofficial YAMAHA Keyboard Resource Site
These files, are from the Usenet newsgroup "alt. Only the status byte has the MIDI channel number encoded. You can display your complete cd collection, and search by field or do cross referencing. One theme not found was the prisoner, an old BBC program which has great music. The content is cute, and it's layout is very well done. It consists of a library of midi files, ranging from pop songs to Broadway and even the Muppet Show. Only the original purchaser of this product has the right to embody and reproduce the enclosed sound samples within their music compositions.