Rionos's '約束' came out on June 6, 2018. With 約束 being less than two minutes long, at 1:46, 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 「あさがおと加瀬さん。」オリジナルサウンドトラック, so we believe that "約束" is a single. 約束 is unknown right now. In our opinion, the overall tone is not very danceable and projects negative sounds, such as being sad, depressed, or angry.

約束 テンポ

The tempo marking of 約束 by Rionos is Lento (slowly), since this song has a tempo of 49 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.

約束 キー

This song has a musical key of C Major. This also means that this song has a camelot key of 8B. So, the perfect camelot match for 8B would be either 8B or 9A. While, 9B can give you a low energy boost. For moderate energy boost, you would use 5B and a high energy boost can either be 10B or 3B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 8A or 7B will give you a low energy drop, 11B would be a moderate one, and 6B or 1B would be a high energy drop. Lastly, 5A allows you to change the mood.