I'm assuming this thread talks about original soundtracks because it's kinda unfair to have games that use licensed music compare against games that have original soundtracks.
Rayman Legends
Rayman Origins
Mario Sports Mix
Kirby's Epic Yarn
Mario Kart 8
Super Mario Galaxy
Super Mario Galaxy 2
Super Mario 3D World
Mario Hoops 3-on-3
Mario & Sonic games
Donkey Kong 64
Diddy Kong Racing
Mario Superstar Baseball
Mario Super Sluggers
Super Mario Galaxy
Super Mario Galaxy 2
Super Mario 64
Mario Kart 8
Donkey Kong Country 2 (and the original to a lesser degree)
Splatoon
And possibly some that I'm forgetting.
-Akumajou Dracula X: Chi no Rondo/Castlevania: Rondo of Blood
-Castlevania: Symphony of the Night
-Great Giana Sisters
-Turrican
-Turrican 2
-Street Fighter series
-Mega Man X series
-Mega Man series
-Metroid series
-Shenmue 1 and 2
-Zelda series
.. and so much more
A few of my favourite games might have sneaked in:
Super Mario Galaxy 1 / 2 / 3D World (Odyssey's is shaping up to be just as good from what I've heard)
Cave Story (specifically the 3D/remastered version)
Donkey Kong Country Returns / Tropical Freeze
Fire Emblem Awakening / Fates
Kirby's Epic Yarn
The Legend of Zelda: Breath of the Wild
Mario Kart 8
Metroid Prime
Paper Mario: Colour Splash
The Simpsons: Hit & Run
Spyro: A Hero's Tail
Super Paper Mario
Super Smash Bros. Brawl
Yoshi's Woolly World