Well you don't have to make it as long as all that, but the fact is the music is by Christopher Young. If nothing else, it's just from the movie "Hard Rain." I could hum the music and thus I'm performing it, but it doesn't make it mine, so saying "Music by Delphinus" would be .. well.. wrong. Sorry!
In the case of Cirque, all that music is proprietary, so you could just credit it as "Cirque Du Soleil" (although you could maybe mention the show it's from if you were really keen).
Sorry, I'll stop splitting hairs. But get it right then darn it!!!!
