in rock-longer than 6
in metal-longer then 7
in prog-longer than 20
six degrees of inner turbulence by dream theater is a long prog song because it is 42 minutes long.
Me- "hey billy wanna listen to a really long song?"
Billy-"through the fire and flames by dragonforce? that song is almost 8 minutes long!"
Me-"no six degrees of inner turbulence by dream theater, it is 42 minutes long"
Billy-"okay you sexy machine"