Herbert made "I Hadn't Known (I only heard) - Bonus Track" available on October 20, 2013. Since I Hadn't Known (I only heard) - Bonus Track is still less than 10 minute long, it is still considered a pretty long duration song compared to the average song length. This song does not appear to be explicit due to the lack of the "E" tag. The song is number 14 out of 21 in Around The House (Special Edition) by Herbert. Going off of the ISRC code of this track, we detected that the origin of this track is from United Kingdom. In terms of popularity, I Hadn't Known (I only heard) - Bonus Track is currently below average in popularity. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.
The tempo marking of I Hadn't Known (I only heard) - Bonus Track by Herbert is Andante (at a walking pace), since this song has a tempo of 99 テンポ. With that information, we can conclude that the song has a slow tempo. The time signature for this track is 4/4.
This song is in the music 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.