What about singing?

Hi all,

I was looking at the exercises database and I noticed that there are some music activities listed, such as guitar, drugms, etc. playing.

I am going to add singing as well, as I can assure you it IS an activity, a great one!

How would you advise me to calculate the calorie lost during singing on stage?
(Meaning: I am not sitting, but stading all the time, a little bit of dancing, or at least moving with the music, singing loud, kind of "acting" as the lyrics go, etc.. well I am an emotional performer )

Thanks!
D.