That's really tough, since there's so many great games with great music.
The Mario kart 8 soundtrack is breathtaking, with so many fun tracks and throwbacks to previous games.
I'm currently playing through xenoblade chronicles, and that soundtrack is just beautiful, especially "engage the enemy," which plays during specific cutscenes.
Twilight Princess and Wind Waker had great soundtracks as well.
Fire emblem awakening, bravely default, shovel knoght... Not only are all these games extremely fun with interesting stories, but the music in all of them is just so well done.