Alaskan Malamutes are very quiet dogs and do not bark like other dogs, but they have a language that only they understand :)
The sound that these dogs produce is most similar to wolves hownling.
If you have two or more Malamutes, they will howling like a pack (sound for my brain :) - like song of siren), they will howling together and they will stop in the same time.
Malamute howling video:
They will howl at the sound of sirens, barking of other dogs or for some reason known only to them.
Your neighbors will not be able to hide the happiness when they hear howling of your dogs :)