だから僕は音楽を辞めた (Dakara Boku wa Ongaku wo Yameta, "That's Why I Quit Music") arrived in maimai DX PLUS on January 23, 2020, as part of the expansion's lineup of tracks from Japanese duo Yorushika. The song shares its name with and serves as the title track of Yorushika's debut full-length album, released in 2019. The duo brings together composer n-buna, a VOCALOID producer well known in rhythm-game circles for songs such as ウミユリ海底譚, which also appears in maimai, and vocalist suis, whose airy, melancholic delivery defines the track's introspective mood. Within maimai, the song is classified under POPS & Anime and plays at a BPM of 150. Its Master chart (level 12+, designed by Jack) stands out for its heavy concentration of Touch notes, 153 out of 643 total, roughly 24% of the note count, making it one of the more touch-intensive charts from the DX PLUS era. The Expert chart (level 8+, designed by はっぴー) offers a more conventional challenge at a lower density. Across maimai version updates, the Master difficulty has shifted between 12 and 12+, and the Basic chart was lowered from level 3 to level 2, reflecting ongoing rebalancing by the development team.