Designed from the ground up for music composition.
Used by thousands of composers since 2010.
RapidComposer is an innovative, phrase-based music composition tool, offering a flexible, non-destructive workflow tailored for composers, songwriters, and musicians of all genres. RapidComposer makes it easy to turn your musical ideas into reality.
Latest News:
February 9, 2026: RapidComposer v6.0.7 released
November 15, 2025: 41 Realtime posted new videos about "Live mode" and other tutorials: Live mode 1 - 2 - 3, Tutorial 1 - 2 - 3 - 4 - 5
October 8, 2025: RapidComposer 6 released! See what’s new in this version.
April, 2025: RapidComposer 15th Anniversary!
Upgrade to version 6 with a discount! Read upgrade info
Effortlessly craft rich chord progressions and utilize piano-style phrases, even without prior piano experience. Auto-harmonize melodies, receive chord suggestions, and load MIDI files with built-in chord detection. With tools like the chord palette and the Circle of Fifths chart, RapidComposer provides constant support to enhance your songwriting process.
Phrases automatically adapt to the current chord and scale on the master track, eliminating the need to adjust individual notes. Simply lay out chords on the master track or drop in a chord progression, and with a single keystroke, generate a harmony track with flawless voice leading. Start composing with ease today!
Included rhythm and phrase generators allow for creating a wide range of patterns, both monophonic and polyphonic. Generate melodies, apply variations to modify phrases non-destructively, and easily slice or adjust the rhythm of existing phrases.
Leverage an intelligent algorithm to generate optimal guitar chord fingerings based on your specific constraints. Easily edit fingerings directly on the fretboard. Convert tracks into editable guitar tablature with calculated, optimized fingerings. Export tabs seamlessly in MusicXML format for further use.
Suggestions by harmonic rules, borrowed chords, chord substitutions, pivot chords, diatonic and chromatic mediant chords, passing chords, bass and melody pedal tone chords, chords on scale, chord builder, chord voicing editor. With these tools, you'll always have guidance for selecting the perfect chords.
RapidComposer provides multiple methods for selecting chords for the master track or progressions, including the Tonnetz and Circle of Fifths. Chord buttons can be color-coded by consonance, common tones, tonality, or suggestions. Customize chord rules for progressions and apply chord voicings to individual tracks, phrases, or the master track.
With it, you can instantly create new multi-track compositions or phrases, or even let the engine continue an existing melody or arrangement. It’s a powerful way to spark creativity and explore new musical ideas inside RapidComposer.
* Full Edition only
Trigger and perform sections of your composition from a MIDI keyboard in real time, with per-track speed, transpose, and timing controls. Mouse triggering also supported. With LIVE Playback Mode in RapidComposer 6, your compositions are no longer static: they become expressive, playable instruments.
* Full Edition only
The AI assistant, available in both full and light editions, offers intelligent suggestions for chord replacements, progressions, rules, and even song structure based on the genre or mood you specify. Powered by AI models from multiple providers, this feature requires an API key from a supported service.
RapidComposer generates multi-track compositions with chords based on your settings and phrases, supporting a variety of workflows. It's designed to inspire creativity, even when you're not short on ideas.
* Full Edition only
Melodya is a motive generator and editor, which was integrated into RapidComposer as a Melody Editor tab. By enabling the chords track, you can create a melody for a given chord progression, so two entirely different workflows are supported.
* Full Edition only
The extensive libraries for chords, scales, and chord progressions are fully expandable. Use the docked browsers to search, preview, sort, group, and display items. Additionally, a file browser and a CC envelope browser have been included for enhanced navigation.
Ren booted the game in a loop of static and faded opening themes. The menu sprang to life, colors thin but stubborn, like memory refusing to die. There, tucked under the translucent save icon, was the file: "Hoshi." No level digits, no playtime counter—only a single emblem, a subtle icon of the Akatsuki cloud stitched into the corner. He pressed start the way one might lift the lid off an old music box.
Sometimes artifacts aren't valuable because they're rare, but because they carry choices that outlast their makers. In a world that prizes completion, the verified save file remembered what completion never could: the human reason for pausing mid-quest—to hold a hand, to honor a promise, to leave room for someone else to come home. Ren booted the game in a loop of
The file opened to a save state that felt like a snapshot from a different heartbeat: missions completed, characters unlocked, a final battle flagged as "Cleared — True Ending." But the inventory spoke louder than the stats. It contained a strange assortment of items: a scroll labeled in brush-strokes, a photograph of two children under a storm of lanterns, and a message encoded as a journal entry in the game's save log. He pressed start the way one might lift
Weeks later, an online forum lit up with a user named Hoshi. The avatar was a simple star. Their first post was sparse: "Lost my PSP years ago. If someone finds a save under Hoshi, please say hello." Ren replied with the photograph and a single line: "Promise kept." Hoshi wrote back in the quiet way of someone who had been waiting: "I left it there because I couldn't save the right ending. Thank you for keeping it safe." The file opened to a save state that
He dug deeper. The photograph—pixelated, but clear enough—showed two small silhouettes beneath paper lanterns, their faces turned away, hands almost touching. The caption: "Promise on the seventh night." He wondered who promised whom. The journal continued:
The save file, verified, had become a vessel for compassion. It recorded not only who had cleared the missions but who chose to shield, to pause, to keep. When Ren finally beat the final boss, he didn't rush to the ending. He allowed the characters to sit for a while, watching an in-game sunset, and he wrote in the journal entry field a single sentence: "We chose the safe path. The lanterns are still there."
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