> I've never managed the final "yea-HO" in Santa Fe Trail, either (and I've only ever heard one person hit it).

You may have come across my tale of Bellamy haranguing an audience halfway through the chorus of 'Santa Fe Trail': 'Come on you BAHSTARDS, there's a wonderful harmony to this, and not one of you is getting it!'

When I used to sing it with Gordon Tyrrall, it was a matter of high principle to get that top G in the harmony. Though I had to go falsetto to bend it upwards to A, as PB liked to do.