RapidComposer is a unique, non-destructive, phrase-based music prototyping software designed for composers, song-writers and musicians of all musical styles (for Windows and macOS).

Create great sounding chord progressions, use piano-style phrases even if you’ve never touched a piano, auto-harmonize melodies, get chord suggestions, load MIDI files with chord detection, use the chord palette or the “circle of fifths” chart, RapidComposer will always assist you in songwriting.

Features
Unique non-destructive, phrase-based music composition.
Advanced tools for phrase editing, phrase morphing, phrase generation, phrase grouping, motif development, chord progression editing.
Chord suggestions, chord progression generation, chord progression rules editing.
Melody generation, melody harmonization.
Timeline with chords (absolute or chord functions) which all phrases automatically conform to.
Piano roll with scale notes, visually editable chord notes, and smart arranging of overlapped notes in two styles.
In-place non-destructive phrase-level and note-level editing.
Sophisticated MIDI CC editing and recording.
Articulations can be assigned to phrases or even individual notes.
Extensive scale, chord, guitar chord, chord progression databases.
Movable, resizable and transposable smart phrases that always conform to the current chord.
Phrase and rhythm generators help you to create thousands of musically useful (not random) phrases.
Taggable instrument database of all MIDI, VSTi and SF2 presets in one place.
Variations can be applied to phrases, or whole tracks.
IdeaTool that can generate a multitrack composition based on the provided parameters and rules.
Intuitive drag and drop environment (you can drop chords, progressions, phrases, instruments to the composition).
Fully customizable user interface with preset themes.
Unlimited undo and the ability to make several versions of the same composition.
MIDI drag-and-drop tracks or composition to DAWs.
Virtual instruments (VSTi v2.4 plug-ins) support.
SoundFont (.SF2) support.
Standalone and VST version (32-bit and 64-bit).
Available for Windows and Mac OS X.

Homepage musicdevelopments.com/rc.html