"空虚" by 石塚徹 was released on November 29, 2017. With 空虚 being less than two minutes long, at 1:35, we are fairly confident that this song is not explicit and is safe for all ages. Based on the duration of this song, this song duration is much smaller than the average song duration. There is only one song in 映画『火花』サウンドトラック, so we believe that "空虚" is a single. The popularity of 空虚 is currently not that popular right now. In our opinion, the overall tone is not very danceable and projects negative sounds, such as being sad, depressed, or angry.

空虚 テンポ

The tempo marking of 空虚 by 石塚徹 is Vivace (lively and fast), since this song has a tempo of 170 テンポ. With that information, we can conclude that the song has a fast tempo. The time signature for this track is 4/4.

空虚 キー

B Minor is the music key of this track. 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.