It is true. They can. Connecticut newspaper TheDay.com has this interesting comment:

The first time I ever heard whale music — which became sorta popular at the dawn of the New Age phenomenon — I literally thought it was a joke. But, no. People literally recorded the mournful cries of whales and either released them as “solo” works or put gentle, peace-inducing backing tracks comprised of lush strings or oboes or flutes or even the sound of incense sticks smoldering into a microphone.

And more:

Think about this in light of the latest killer whale/human tragedy at amusement parks. Maybe the whale’s music was a sort of primitive Siren’s Song — designed to lull us into trust and comfort so they could turn on us and shred us like sides of mutton tossed into a hay thresher!

Or perhaps killer whales have their own music distinct from the New Agey peace-shrieks of the other whales. And the killer whale music sounds like Norwegian Satan Metal, only with a slight, effervescent bubbly tone because, after all, it’s underwater.

As a Norwegian I can only say; this is very likely. Very likely indeed. I will make sure to check iTunes often for this new Satan Metal/whale music crossover. 

Read the whole article here.