Nintendo announced on January 28th, 2025 that the music from Pokémon LEGENDS Arceus is now available on the Nintendo Music app to celebrate the 3rd anniversary of the launch of the game on January 28th, 2022. Nintendo Switch Online members can enjoy music from certain Nintendo games on this smart-device app. 102 of the 110 released tracks from the CDs are available to listen to on Nintendo Music.

The following 8 tracks are not included on Nintendo Music:
1-5 Obtained a Key Item
1-9 Mission Begins
1-10 You Got a Pokémon
1-14 You Caught a Pokémon
1-15 You Got an Item
1-20 Level Up!
1-32 Congratulations! Your Pokémon Evolved!
1-38 Mission Complete

Nintendo Switch Online加入者向けのスマートフォンアプリ『Nintendo Music』に、『Pokémon LEGENDS アルセウス』のゲーム音楽が新たに追加されたよ！
ヒスイ地方での冒険に思いを馳せてみよう！

Sources: https://share.m.nintendo.com/en-US/US/officialPlaylists/c970fa40-6f9a-45f9-9b66-be71b1507066/ and https://x.com/Pokemon_cojp/status/1884073952705675622