What type of sea creature can make a sound louder than a gun?

Pistol shrimp (or snapping shrimp), which can produce a shockwave with its snapping claw that generates sounds well over 200 decibels, surpassing the intensity of a gunshot. The sound isn't from the claw hitting, but rather from a cavitation bubble that forms and then implodes when the claw snaps shut, creating a brief, incredibly powerful sonic blast that can stun or kill prey.

Today's question is

What whales sing the most complex songs in the animal kingdom?