Quote:

.... the MIDI tracks don't sound exactly like the recording, same arrangement but different voices, so the musicians must be playing them.






If this is the issue Bob, I don't think it would be that difficult - for most reasonably well known tunes -
to find a karaoke version on the www that does not sound like exactly like the original.

Deezer, for example has upwards of 30 karaoke versions of Jambalaya.
After that, we all know how to use audio editor software.

Of course I am not condoning this or any other illegal practice.
Neither do I do it myself. I'm just saying it could be done.

Marc