鈴木勝吾, 久保田秀敏, 山本一慶, ミュージカル『憂国のモリアーティ』Op.2's '闇の歌劇（Ⅱ）' came out on August 17, 2022. With 闇の歌劇（Ⅱ） being less than two minutes long, at 1:43, we are fairly confident that this song is not explicit and is safe for all ages. Based on the duration of this song, this song duration is much smaller than the average song duration. There is only one song in ミュージカル『憂国のモリアーティ』Song Collection -Op.1/Op.2/Op.3-, so we believe that "闇の歌劇（Ⅱ）" is a single. 闇の歌劇（Ⅱ） is not that popular right now. In our opinion, the overall tone is not very danceable and projects negative sounds, such as being sad, depressed, or angry.

闇の歌劇（Ⅱ） テンポ

The tempo marking of 闇の歌劇（Ⅱ） by 鈴木勝吾, 久保田秀敏, 山本一慶, ミュージカル『憂国のモリアーティ』Op.2 is Adagio (slowly with great expression), since this song has a tempo of 68 テンポ. With that information, we can conclude that the song has a slow tempo. The time signature for this track is 3/4.

闇の歌劇（Ⅱ） キー

D Major is the music key of this track. This also means that this song has a camelot key of 10B. So, the perfect camelot match for 10B would be either 10B or 11A. While, 11B can give you a low energy boost. For moderate energy boost, you would use 7B and a high energy boost can either be 12B or 5B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 10A or 9B will give you a low energy drop, 1B would be a moderate one, and 8B or 3B would be a high energy drop. Lastly, 7A allows you to change the mood.