It must suck to be stuck in captivity. Luckily, every now and then a Mariachi band comes along and serenades you, which would cheer up even the most dour-faced Beluga whale.

This one obviously has a penchant for Mexican music. See how it nods appreciatively? It's practically smiling with glee! No dour faces here.

What will it do if they start playing it Slipknot songs?