Outsider Heart's 'IDKU' came out on May 14, 2021. With this song being around four minutes long, at 3:32, 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. Because this song is the only song in IDKU and no other songs are present in the album, we classify this track as a single. Based on our statistics, IDKU's popularity is below average in popularity right now. Although the tone can be danceable to some, this track does projects more of a negative sound rather than a postive one.

IDKU テンポ

We consider the tempo marking of IDKU by Outsider Heart to be Allegro (fast, quick, and bright) because the track has a tempo of 132 テンポ, a half-time of 66テンポ, and a double-time of 264 テンポ. Based on that, the speed of the song's tempo is fast. Activities such as, walking, can go well with this song. The time signature for this track is 4/4.

IDKU キー

This song has a musical key of D♭ Minor. This also means that this song has a camelot key of 12A. So, the perfect camelot match for 12A would be either 12A or 11B. While, a low energy boost can consist of either 12B or 1A. For moderate energy boost, you would use 9A and a high energy boost can either be 2A or 7A. However, if you are looking for a low energy drop, finding a song with a camelot key of 11A would be a great choice. Where 3A would give you a moderate drop, and 10A or 5A would be a high energy drop. Lastly, 3B allows you to change the mood.