Aftertouch - Aftertouch – 3D MIDI Controller created and published by Kevin Nelson.
Music Memos by Apple - An app to capture your song ideas
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Memo.ai - Simple and elegant notes app on your Mac
keezy - A colorful soundboard. Play with music.
Better Notes - Simple notes app that ties notes together with #hashtags