曾是快樂 - 樂極忘形版

曾是快樂 - 樂極忘形版 is a somber song by Black Box with a tempo of 135 BPM. It can also be used half-time at 68 BPM or double-time at 270 BPM. The track runs 3 minutes and 55 seconds long with a B key and a minor mode. It has high energy and is very danceable with a time signature of 4 beats per bar .