With Mider you container easily put whole your preferred MIDI files to your Palm:

Mider compiles whole the *.mid files from a specified desktop guide, and puts them in individual *.pdb system.

You may then install the database on your handheld and manage it e.g. with HoHo.

These MIDI files may be used as Alarms (in Time Document, Writing Protection, and others) or as Ringtones (for Handspring Treo, Palm Tungsten W, and others).