Registration will get you the following:
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1) No opening nag screen.
2) Limit of 1000 albums per file (currently 40).
3) Utility to convert any current music type to any other type that YOU provide (when v4.0 comes around).  For example: "Sound Track" --> "Musical".
4) Support the SHAREWARE concept.

To register, use the registration form provided in the "Music+" opening screen.