What are some alternatives?
When comparing Impro-Visor and OpenMPT, you can also consider the following products
MuseScore - 24 Sep 2012 . Design a homepage that captures attention and serves as a good starting point for navigating the website.
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.
Band-in-a-Box - Band-in-a-Box is so easy to use!
MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
TuxGuitar - A Multitrack tablature editor and player.