玩具狂奏曲 -終焉- (Gangu Kyousoukyoku -Shuuen-) is an instrumental piece by the composer Kikuo (きくお), first featured in the CHUNITHM AIR rhythm game and later ported to maimai DX as part of the オンゲキ＆CHUNITHM (ONGEKI & CHUNITHM) cross-series genre category. The title itself carries a deliberate wordplay: the standard Japanese term for "rhapsody" is 狂詩曲 (kyoushikyoku, lit. "mad poem piece"), but here the character 詩 (poem) is swapped for 奏 (performance) to yield 狂奏曲, a "mad performance piece" befitting the song's frenetic energy. The subtitle -終焉- (Shuuen, meaning "the end" or "demise") frames the track as a culminating or final statement. At 130 BPM, the composition unfolds with Kikuo's characteristically dark and surreal palette, layering dissonant melodies and driving rhythms over an ominous atmosphere. The jacket illustration features リリアリス・コルチカム (Liliaris Colchicum), a character originating from CHUNITHM, reinforcing the cross-game lineage. In maimai DX, the song has undergone several difficulty revisions across versions, with the Master chart, designed by サファ太 (Safa Ta), settling at a 13+ difficulty with a constant of 13.9, placing it among the more demanding charts in its tier. The Expert chart was designed by シチミヘルツ (Shichimi Hertz).