Sao lâu không thấy em cười?

Sao lâu không thấy em cười? is a somber song by Phạm Nguyên Ngọc with a tempo of 130 BPM. It can also be used half-time at 65 BPM or double-time at 260 BPM. The track runs 4 minutes and 32 seconds long with a G key and a major mode. It has low energy and is somewhat danceable with a time signature of 4 beats per bar .