mg -- I think what they're trying to do is something like the Irish sean-nos ("old style") singing, in which the (unaccompanied) singer is not bound by the underlying meter of the lyrics, but is instead free to emphasize and stretch syllables, as well as improvise melodic ornamentation. This is a venerable tradition in the Irish-speaking areas (gaeltachts). Here is an example. Here is a man singing. I don't find it annoying at all.