Formed from the HEP HEPs, there is a HEP HEP Army, which is joined by simply chanting "HEP! HEP! HEP! HEP!" during an appropriate time in a Nightwish song.
"And one more time, come on and HEP! HEP!"
"I went to a Nightwish concert last night: I joined the HEP HEP Army!"
"I love Anette's HEP HEPs: they really get the audience going!"