Thanks for this thread...guess I felt it before I knew!
My singing pulled me through a lot of bad times in my life...thankful for that..
Would like to know as well if there is a different chemical reaction in singing solo or together with other people.
Considering my latest experience just a couple of weeks back -when a rather large crowd of people joined in with my (unaccompanied) singing- that it probably IS different...I never felt so elated before...it was the very first time that such a thing happened to me, by the way...