The ending might have sucked but the soundtrack to this series has always been excellent. Here is the nice piano piece during the end sequence. This great arrangement was done by Sebastian Wolff. You can get the sheet music here:
http://sebastianwolff.info/news/2012/03/mass-effect-3-an-end-once-and-for-all-sheet-music/
http://sebastianwolff.info/news/2012/03/mass-effect-3-an-end-once-and-for-all-sheet-music/