Mac users interested in Music notation viewer generally download:
ong! Viewer allows to display, print and play back MusicXML documents.
Additional suggestions for Music notation viewer by our robot:
ChordPro Buddy - a song editor for the Mac What is it good for?
editor and viewer...the chord...different chord notations. Import
Viewer for TablEdit tablature files. TEFview allows you as well to view and listen to PowerTab files....
TEFview...and sheet music
Small utility that allows you to quickly typeset LaTeX equations, without bothering with file creation, preambles, and so on....
and the viewer/editor palette...letter or notation from LaTeX...LaTeXiT (viewer/editor