Summer Refrain (ハルルナVer.) by キュインMUSIC@HEIWA Song Details

キュインMUSIC@HEIWA's ' "Summer Refrain (ハルルナVer.)" was released on its scheduled release date, September 9, 2025. With this song being around four minutes long, at 4:19, the duration of this song is pretty average compared to other songs. This track is safe for children and doesn't appear to contain any foul language, since the "Explicit" tag was not present in this track. Since Summer Refrain (ハルルナVer.) only contains only one song in the album, we like to consider this song as a single. Based on our statistics, Summer Refrain (ハルルナVer.)'s popularity is not that popular right now. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

BPM and Tempo

With Summer Refrain (ハルルナVer.) by キュインMUSIC@HEIWA having a BPM of 150 with a half-time of 75 BPM and a double-time of 300 BPM, we would consider this track to have a Allegro (fast, quick, and bright) tempo marking. Because of this, we believe that the song has an overall fast tempo. Looking at the BPM of this song, this song might go great with jogging or cycling. The time signature for this track is 4/4.

Music Key

B Major is the music key of this track. Or for those who are familiar with the camelot wheel, this song has a camelot key of 1B. So, the perfect camelot match for 1B would be either 1B or 2A. While, 2B can give you a low energy boost. For moderate energy boost, you would use 10B and a high energy boost can either be 3B or 8B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 1A or 12B will give you a low energy drop, 4B would be a moderate one, and 11B or 6B would be a high energy drop. Lastly, 10A allows you to change the mood.

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