MIDI/KAR update: In looking for a midi-converter, I found the Midi Karoke Library:

http://www.midikaraoke.com/home/index.html

This is a non-profit educational resource for music students. In their FAQ section I found this definition for Karaoke files:

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Karaoke Files - (.Kar)

Karaoke files are simply midi files with lyrics added. If you would like to play a .kar file with your standard midi player simple change the file extension to .mid and viola it's just a regular midi file that pays the same as any midi file. As a matter of fact to might be surprised to find lyrics in some of the midi files you already have.

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With this in mind, I made a floppy of Louis-Simon's "Beatles" songs, changed the file extension to "mid" from "kar" and took the disk to the PSR 2000. All the files (except one and I'm not sure why the exception) played fine AND showed lyrics in the Lyrics section and music and lyrics in the Score section. No conversion needed.

Out of curiosity, I took the floppy back to my PC and renamed one of the files back to "kar" from "mid" and then tried it in the PSR 2000. They LYRICS showed inthe Lyrics display, but in the score display, the lyrics showed, but no music notation. Thus, the PSR interpreted the "kar" file as one with lyrics, but when the file is renamed to a "mid" file, both lyrics and score are shown.

Thus, with all the "kar" files all over the internet, PSR 2000 owners have a huge library of songs to choose from for playing lyrics and/or music.