GIRLFRIEND's '15' came out on February 21, 2018. With this song being about 5 minutes long, at 5:19, "15" by GIRLFRIEND is fairly a long song compared to the average song length. This song does not have an "Explicit" tag, making it safe for all ages. The song is number 7 out of 14 in CHOCOLATE by GIRLFRIEND. 15 is not that popular right now. Although the tone can be danceable to some, this track does projects more of a negative sound rather than a postive one.

15 テンポ

The tempo marking of 15 by GIRLFRIEND is Andante (at a walking pace), since this song has a tempo of 78 テンポ. With that information, we can conclude that the song has a slow tempo. The time signature for this track is 4/4.

15 キー

This song is in the music key of F Major. 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.