Ta-ku made "Night 21" available on December 21, 2018. The duration of Night 21 is about two minutes long, specifically at 2:21. This song does not appear to have any foul language. Night 21's duration is considered a little bit shorter than the average duration of a typical track. There is only one song in 25 Nights for Nujabes, so we believe that "Night 21" is a single. In terms of popularity, Night 21 is currently below average in popularity. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.

Night 21 テンポ

The tempo marking of Night 21 by Ta-ku is Andante (at a walking pace), since this song has a tempo of 90 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.

Night 21 キー

This song has a musical key of B Minor. This also means that this song has a camelot key of 10A. So, the perfect camelot match for 10A would be either 10A or 9B. While, a low energy boost can consist of either 10B or 11A. For moderate energy boost, you would use 7A and a high energy boost can either be 12A or 5A. However, if you are looking for a low energy drop, finding a song with a camelot key of 9A would be a great choice. Where 1A would give you a moderate drop, and 8A or 3A would be a high energy drop. Lastly, 1B allows you to change the mood.