There are certain times when I feel something like that in my bands.
I really love the guys I play with in my bands, and there are some gigs when we just mesh perfectly, and the sound gives me goosebumps.
Also, I'll never forget the time when we first heard ourselves in a recording, which gave the same effect.
I think a lot of it is the pride I have in playing with these guys. There's a certain exhilaration when I hear my friends doing something well.
Its the same sort of pride when I see band's we are friends with do well. The love we have for the music and the people gives a really euphoric feeling. I feel a sense of community or understanding from everyone, and we all share this intangible feeling of love or happiness.