I think it's simpler. The original version is the lower _speed_ version - it's not just
pitched up, but sped up as well IIRC (someone get out a stopwatch). The first few seasons
broadcast over here have the original slower speed, but somewhere around the 3rd season or
so, it gears up a notch.
In the US I am fairly sure that it is consistently
the slower version. I was there half a dozen or so times throughout last year - enough for
the immigration people to get narky anyway - and I'm sure that each time I heard it, it
Strangely, I had assumed that it was tied to the speed of the title
sequence itself. I know that different areas of the world have different minimum number of
frames that are allowable - to stop the old 'blipverts'. I know that Babylon 5 had to be
careful and make their blips be compliant across the whole board. I assumed that given the
rapid nature of the visuals, and the fact that the music was tied to that, that we have
slightly lighter tolerances and are therefore allowed to use the faster version.
Still ... doesn't explain which is the actual speed! But interesting stuff..
Can't someone drop Barenaked Ladies a quick email / tweet and ask??
Personally, I think it sounds better faster / higher.
Veni, Vidi, Aesculi
(I came, I saw, I conkered)