TVXQ! made "O -正.反.合." available on September 29, 2006. With this song being around four minutes long, at 4:15, the duration of this song is pretty average compared to other songs. This track is safe for children and doesn't appear to contain any foul language, since the "Explicit" tag was not present in this track. There are a total of 11 in the song's album "O-正.反.合. - The 3rd Album". In this album, this song's track order is #1. Furthermore, we believe that the track originated from South Korea. In terms of popularity, O -正.反.合. is currently below average in popularity. The overall tone is very danceable, especially with its high energy, which produces more of a euphoric, cheerful, or happy vibe.

O -正.反.合. テンポ

With O -正.反.合. by TVXQ! having a テンポ of 115 with a half-time of 58 テンポ and a double-time of 230 テンポ, we would consider this track to have a Moderato (at a moderate speed) tempo marking. Because of this, we believe that the song has an overall moderate tempo. Looking at the テンポ of this song, this song might go great with walking. The time signature for this track is 4/4.

O -正.反.合. キー

This song has a musical key of C Major. Or for those who are familiar with the camelot wheel, this song has a camelot key of 8B. So, the perfect camelot match for 8B would be either 8B or 9A. While, 9B can give you a low energy boost. For moderate energy boost, you would use 5B and a high energy boost can either be 10B or 3B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 8A or 7B will give you a low energy drop, 11B would be a moderate one, and 6B or 1B would be a high energy drop. Lastly, 5A allows you to change the mood.