Rei Narita made "Summer" available on October 10, 2018. The duration of Summer is about two minutes long, specifically at 2:31. This song does not appear to have any foul language. Summer's duration is considered a little bit shorter than the average duration of a typical track. There is only one song in 自律神経にここちよい音楽 ピアノ・クールダウン~極上のメロディ・コレクション~, so we believe that "Summer" is a single. In terms of popularity, Summer is currently not that popular. Since there is more of a neutral sound being played, this makes the track somewhat danceable.
The tempo marking of Summer by Rei Narita is Andante (at a walking pace), since this song has a tempo of 94 テンポ. With that information, we can conclude that the song has a slow tempo. This song can go great with yoga or pilates. The time signature for this track is 4/4.
This song has a musical key of D Major. 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.