我是你免費的快樂

我是你免費的快樂 is a upbeat song by Zheng Jun with a tempo of 128 BPM. It can also be used half-time at 64 BPM or double-time at 256 BPM. The track runs 3 minutes and 17 seconds long with a C♯/D♭ key and a major mode. It has high energy and is very danceable with a time signature of 4 beats per bar .