Ron,
Why not just use a laptop computer for this purpose? It will do the MP3s, midi files with imbedded lyrics, and lots of other neat things. Then you can play along with the files using your current PSR-2000.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)