MuseScoreįorked years ago from the Linux music sequencer MusE (a program started back in 1999 and still active today), MuseScore is a superb WYSIWYG music notation program. Otherwise, see each program's website for install instructions.
Fedora Jam includes all of these as well. If you use KXStudio, described in my previous article, Configuring Linux for music recording and production, all the programs mentioned below are either automatically installed or available via apt-get install. This article highlights several of my favorite go-to free/libre/open music apps. Many are also cross-platform, allowing me to promote them to students who still use Windows or OS X. Thankfully, some free/libre/open programs standout as both powerful and truly accessible to total beginners. I personally still miss some aspects of my old OS X tools. In some cases (such as a full switch to GNU/Linux), this can be difficult given all the inconsistent quality and quirks. As a music teacher, I promote free/libre/open software (and music and educational material too!) to my students.