balloon made "アパートメント" available on April 26, 2015. アパートメント is about six minutes long, preciously at 5:45, making this song fairly long compared to other songs. The song is number 11 out of 11 in apartment by balloon. アパートメント is not that popular right now. Since there is more of a neutral sound being played, this makes the track somewhat danceable.
The tempo marking of アパートメント by balloon is Adagio (slowly with great expression), since this song has a tempo of 76 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.
B♭ Major is the music key of this track. This also means that this song has a camelot key of 6B. So, the perfect camelot match for 6B would be either 6B or 7A. While, 7B can give you a low energy boost. For moderate energy boost, you would use 3B and a high energy boost can either be 8B or 1B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 6A or 5B will give you a low energy drop, 9B would be a moderate one, and 4B or 11B would be a high energy drop. Lastly, 3A allows you to change the mood.