MusicDevelopments has announced the release of RapidComposer, which is described as "a rapid music prototyping software designed for composers, song-writers and musicians of all musical styles". It's released for Windows (XP, Vista & 7; x86 and x64) and is currently available for the introductory price of $395.

Features:

• Unique non-destructive, parametric phrase-based music composition.
• Advanced tools for phrase editing, phrase generation, phrase grouping, motif development, chord progression editing.
• 2D view of the composition with structure editor as opposed to 1D view of DAW applications.
• Intuitive drag and drop environment (you can drop chords, progressions, phrases, instruments to the composition).
• Master track with chords.
• 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.
• Extensive scale, chord, guitar chord, chord progression databases.
• Taggable instrument database of all MIDI, VSTi and SF2 presets in one place.
• Variations can be applied to phrases, or whole tracks.
• IdeaTool that generates a multitrack composition based on the parameters and rules that you specify.
• Unlimited undo and the ability to make several versions of the same composition.
• Virtual instruments (VSTi v2.4 plug-ins) support.
• SoundFont (.SF2) support.