I also think you're slightly wrong (or at least exaggerated) in saying that in English "you can't change which syllable is emphasized more than very rarely or it sounds like nonsense". If you take a piece of music and then alter this then sure, but actually the emphasis will often be slightly different to how it would be spoken. I wanted to double check on this belief, and thought about it while listening to Elton John's "I'm Still Standing" (which was already playing) and Stanford's Magnificat in G to add a different genre, in both cases the emphasis is often on different syllables to how we would speak it if we just saw the text without knowing the music.
Anyway, thanks again for the reply, I guess it falls (at least to an extent) into the "simplified for the BBC audience", which is much preferable to the alternative of "it's bullshit". :)
edit: Here's the Stanford piece (with music+lyrics if you're not familiar with the text already): http://www.youtube.com/watch?v=g7UorDdRg60 Was just a random picking off the top of my head (added bonus that it's, in my opinion, one of the most beautiful things ever written)