As I know someone with dyslexia, I installed open dyslexic on my computer and set it up as my default font.

It is a little unusual at first but quite a pleasant font. I have been using it for some time, but it wasn't until I was looking for another generic font that I realized how easy it was to read.

It is great when trying to read something a little too far away, so that makes it a great font for song books as it can be more easily read from your music stand.

You can find it here