This was kind of hard, so I'm just sharing in case it's of any use for anyone else.
How to install:
This part is easy: Just open a terminal and under superuser, type:
yum install mscore
But there was a problem:
After installing MuseScore you had no sound... despite the fact the installation grabbed at least one soundfont
How I solved it:
I installed JACK audio server in my system, and Qsynth or Qjackctl as a GUI to manage it. In my experience, Qsynth was easier to configure, so I suggest using that one.
In Qsynth, I clicked on setup, changed MIDI driver to "jack", then selected a soundfont on... well... Soundfonts
After that, I opened MuseScore, went to edit > preferences > I/O and checked "use internal synthetizer" and "JACK audio server", unchecking the rest.
After this, I closed and restarted MuseScore. I had sound now.
---------- Post added at 09:21 PM ---------- Previous post was at 09:19 PM ----------
Almost forgot... You need to start Qsynth and activate the JACK audio server there before every time you will open MuseScore. If you forget, you won't have sound again.