What are some alternatives?
When comparing Band-in-a-Box and Impro-Visor, you can also consider the following products
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
MuseScore - 24 Sep 2012 . Design a homepage that captures attention and serves as a good starting point for navigating the website.
VArranger - vArranger is a PC arranger software, playing Yamaha, Roland and Ketron styles in realtime !
Guitar Pro 7 - Create, play and share your tabs
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Odesi - ODESI is a music sketchpad that exports your projects to Audio and MIDI.