Keiko Matsui made "Proof" available on July 30, 2013. With this song being about 5 minutes long, at 4:59, "Proof" by Keiko Matsui 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. There are a total of 10 in the song's album "Soul Quest". In this album, this song's track order is #8. Proof is not that popular right now. The overall tone is very danceable, especially with its high energy, which produces more of a euphoric, cheerful, or happy vibe.

Proof テンポ

With Proof by Keiko Matsui having a テンポ of 82 with a half-time of 41 テンポ and a double-time of 164 テンポ, we would consider this track to have a Andante (at a walking pace) tempo marking. Because of this, we believe that the song has an overall slow tempo. The time signature for this track is 4/4.

Proof キー

This song is in the music key of G Major. Or for those who are familiar with the camelot wheel, this song has a camelot key of 9B. So, the perfect camelot match for 9B would be either 9B or 10A. While, 10B can give you a low energy boost. For moderate energy boost, you would use 6B and a high energy boost can either be 11B or 4B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 9A or 8B will give you a low energy drop, 12B would be a moderate one, and 7B or 2B would be a high energy drop. Lastly, 6A allows you to change the mood.