Hello, Helen. It's nice to meet another user of Noteworthy Composer. I was using that and a MIDI keyboard (aka MIDI controller) to get started on 'Morning Glory.'
Once a person has the musical knowledge to sound out a melody, s/he can do so much with a MIDI keyboard and a MIDI program - write music down, change the key, write harmony parts, compose original pieces, figure out chords. It adds so much to one's musical life.