Impro-Visor

Active

Country: United States (US)
Founded: 2005
Developer: Harvey Mudd College (primarily developed by Prof. Robert Keller)
Pricing: Free (open-source)
Open source: Yes
Platforms: Windows, macOS, Linux

Indexes

Music Notation

Overview

Impro-Visor is a music notation tool for creating monophonic lead sheets and generating backing tracks from chord symbols, oriented toward jazz improvisation education.¹²³ It provides visual harmonic feedback through note coloration, lick databases, automatic lick generation from grammars, and style-based accompaniment for piano, bass, and drums.¹²³ Targeted at jazz musicians and learners, it stands out with its text-based file format for easy customization and grammatical inference from solos.²³

Key Features

Lead Sheet Creation - Point-and-click or text-based entry of chords and monophonic melodies with visual harmonic hints.
Automatic Accompaniment - Generates piano, bass, and drum backing tracks from chord progressions in user-selectable styles.
Lick Generation - Produces licks or choruses in real-time using modifiable grammars.
Grammar Learning - Automatically infers melodic grammars from transcribed solos.
Note Coloration - Colors notes by consonance/dissonance relative to chords and scales for improvisation advice.
Roadmap Editor - Quick chord entry with analysis of keys and progressions.
Style Editor - Customizable accompaniment styles via textual patterns.
MIDI Import/Export - Imports single-track MIDI and exports MIDI or MusicXML.

Pricing

Plan	Price	Includes
Free	$0	Full access to all features, open-source.

Platforms & Requirements

Runs on Windows (XP and later), macOS, and Linux with Java 1.8 or later required.³⁵⁷ Uses Java and MIDI for cross-platform compatibility, with potential sound issues if platform MIDI implementation is faulty.⁵ Limited to monophonic lines; no polyphony support.⁵

Integrations & Ecosystem

MusicXML import via MuseScore
MusicXML export
MIDI import (single track)
MIDI export
Text file leadsheets editable in any editor

Alternatives

App	Difference
Band-in-a-Box	More full-featured auto-accompaniment but commercial and less focused on lick generation/grammar learning.
MuseScore	General notation with polyphony support but lacks built-in jazz improvisation tools and auto-lick generation.
iReal Pro	Mobile-focused fake book player with simpler accompaniment; no advanced grammar-based licks.

Reputation

Impro-Visor is regarded as a valuable free educational tool for jazz improvisation practice and teaching, praised for lick generation, grammar learning, and open customization via text files.¹²³⁴ Users note its utility as a Band-in-a-Box alternative for leadsheets and solos, though it's primarily a practice aid rather than performance software.⁴ Criticisms include monophonic limitation and reliance on Java/MIDI which may cause platform-specific sound issues.⁵

Sources (8)