yeah - the Common Loon is better known as the Great Northern Diver in Europe, and the Pacific Loon, the Black-throated Diver (although some scientists believe there is a case for making the Pacific Diver or Loon a separate species).
I would think that it is likely given the track that it is a Pacific Diver/Loon featured...
Bird calls are incredibly fascinating. Anyone interested in sound should check out David Attenboroughs' 'Life Of Birds'. On there, they show what happens inside a bird to make certain noises, absolutely amazing!
ornithological 'Dr.' Walsh (Young Ornithologist Of The Year 1985!)