@@Mazarine-Msm fr though your said epic twice, but they'd int, most just have more parts to animation to throw off people, no matter what Google or the Internet says, I have compared them they are the same besides the extra parts.
my headcanon is that bemeebeth when he begins to speak he's basically is telling all the monsters to start singing in the final verse which could be why they do this
and im thinking after he stop singing actual lyrics and starts making noises and stuff its bemeebeth showing an example of what he means by using piplash, auglur, nightbear and other monster sounds to encourage the rest of them to all sing in the final verse and when bemeebeth sings again whilst their all playing it inspires others to join in, add new tracks and continue to sing