I thought I blahged about this recently - a snatch of lyric, perhaps "waiting for so long" or "away for so long" sung in a Kate Moss class soprano - but in fact it was that Underworld song, "Stagger", that I blolged about. This snatch would be at home in that same Weekend Sound Track hour, "The Bleak Train Ride Home", but I wouldn't swear that's where it is. It might also be at home in "2AM and 94 Degrees". Or it might not be in the WST at all.
Searching the blawg kind of sucks. Google doesn't like to crawl my parameterized urls. Gonna start getting my feet a little wetter in Webmaster Tools to get more utility from the intersection of Google and Phosphoros.
By sheer luck I happened across my mystery song: Portishead's Humming, from flamingweasel's hour ("Long Dark Tea-time of the Soul") right before "The Bleak Train Ride".