Haruko Momoi made "21世紀" available on March 5, 2008. With this song being about 5 minutes long, at 5:06, "21世紀" by Haruko Momoi 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 11 in the song's album "Sunday early morning". In this album, this song's track order is #3. Based on our statistics, 21世紀's popularity is not that popular right now. Since there is more of a neutral sound being played, this makes the track somewhat danceable.

21世紀 テンポ

With 21世紀 by Haruko Momoi having a テンポ of 140 with a half-time of 70 テンポ and a double-time of 280 テンポ, 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 テンポ of this song, this song might go great with jogging or cycling. The time signature for this track is 4/4.

21世紀 キー

This song is in the music key of E Major. Or for those who are familiar with the camelot wheel, this song has a camelot key of 12B. So, the perfect camelot match for 12B would be either 12B or 1A. While, 1B can give you a low energy boost. For moderate energy boost, you would use 9B and a high energy boost can either be 2B or 7B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 12A or 11B will give you a low energy drop, 3B would be a moderate one, and 10B or 5B would be a high energy drop. Lastly, 9A allows you to change the mood.