Since the launch of the Nintendo Music app in October of last year, Nintendo has consistently been expanding the service (free for Nintendo Switch Online members) with more soundtracks from their extensive library of games.
Today’s update includes nearly five hours of music from Pokémon Sword and Shield, with 138 total tracks added, including the Battle Tower theme composed by Undertale developer Toby Fox.
Nintendo Music is available now for iOS and Android devices from their respective app stores.

Nice!!
The game I want to be added to Nintendo music is Star Fox Assault
Genius Sonority music for Colosseum was epic.