110987, 音楽的同位体 星界's ' "i doll. (feat. Musical Isotope SEKAI)" was released on its scheduled release date, December 29, 2025. The duration of This song is about two minutes long, specifically at 2:13. This song does not appear to have any foul language. i doll. (feat. Musical Isotope SEKAI)'s duration is considered a little bit shorter than the average duration of a typical track. Because this song is the only song in i doll. (feat. Musical Isotope SEKAI) and no other songs are present in the album, we classify this track as a single. The popularity of i doll. (feat. Musical Isotope SEKAI) is currently unknown right now. The overall tone is very danceable, especially with its high energy, which produces more of a euphoric, cheerful, or happy vibe.
We consider the tempo marking of i doll. (feat. Musical Isotope SEKAI) by 110987, 音楽的同位体 星界 to be Vivace (lively and fast) because the track has a tempo of 171 BPM, a half-time of 86BPM, and a double-time of 342 BPM. Based on that, the speed of the song's tempo is fast. The time signature for this track is 4/4.
F Major is the music key of this track. This also means that this song has a camelot key of 7B. So, the perfect camelot match for 7B would be either 7B or 8A. While, 8B can give you a low energy boost. For moderate energy boost, you would use 4B and a high energy boost can either be 9B or 2B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 7A or 6B will give you a low energy drop, 10B would be a moderate one, and 5B or 12B would be a high energy drop. Lastly, 4A allows you to change the mood.
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