Help - music from an ad from 1998

[Fontana]

I remember watching on TV during the mid to late nineties and ad for a brand of stout. It wasn't Guinness, but it may have been for caffery's or young's I'm not sure. I know it definitely wasn't a Guinness ad. Anyway the ad was basically a dream sequence in first person perspective, with a somebody going down darkened corridors in fast forward and was it very strange. The only thing that stands out in my mind is an image of a man with rabbits head who appears at the junction of one of the corridors. The music was slow and psychedelic, quite atmospheric and was absolutely beautiful, I can still recall it to this day. Unfortunately I was quite young at the time and bother to find out who it was by at the time. Does anyone remember such an ad?