Impro-Visor (Jazz Improvisation Advisor) is a leadsheet music notation and auto accompaniment software designed to help jazz musicians compose and hear solos similar to ones that might be improvised. Impro-Visor is for jazz musicians and song-writers who wish to create tunes, improvised solos, transcriptions, or bass lines in the form of lead sheets (chord symbols with melody). Impro-Visor also functions as an auto-accompaniment program, generating styled accompaniment automatically from chord progressions. Solos and/or accompaniment can be exported as MIDI files. The objective is to improve understanding of solo construction and tune chord changes. You can input chord progressions like in Band-in-a-Box, generates solos, use it to transcribe, create accompaniment backing tracks, print out lead sheets, do exercises... It comes with chord files to over 1500 jazz tunes! Impro-Visor is freeware and runs on MacOSX, Windows XP, and Linux.