I've "mastered" another piece for piano. :-p
Truth told, this should really be played a little faster and in a much more carefree way than I plod through it. Still, I manage to hit all (or most) of the notes correctly. I'm not gonna win any competitions, but I guess the main thing is that I enjoy playing.
And one of the pieces I enjoy playing most is this one – "Petites Litanies de Jesus," part of a short song cycle (L'Almanach aux Images) by Gabriel Grovlez. I find this piece charming, even if it's imperfectly played here.