What are some alternatives?
When comparing Sibelius 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
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.
MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
TuxGuitar - A Multitrack tablature editor and player.
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).