I think that the music you have chosen is a great tune, and it was good of you to provide the option of "No music" to those who dislike it. As a humble suggestion though, maybe we can have more variety? I mean you can include classical, rock, pop, etc. Just make 4 genres, or five if you like. I was thinking about it when I remembered about KXStudio install. It lets you choose a genre (out of three, I think) and they have quite a high-quality music (I personally prefer their classical one, it just feels good). And if the music is without words you don't need a big file as you can just play it in the loop (just don't make it too short for people to get annoyed), and nobody will really notice that it is repeating.
You have a lot of entries in the boot menu and I don't think that increasing them by providing options to choose genre will be a good idea, but maybe it can be done as a sub-menu?
Maybe it was asked before, if it was I am sorry for asking again.