Reagan didn't sing with Lyin' Brian. Mulroney just belted out that annoying song with "the wives" while Ronny smiled and waved.
And Pat Boone and Alice Cooper are friends who often play golf together. One of the reasons PB decided to do that album of Rock covers a few years ago.
Personally, though I am a big fan of both Willie Nelson and Daniel Lanois, I didn't think the Teatro CD came off that well. To me, Willie sounded too hemmed-in by all the production.