As pointed out by Alan Ackerman in this message, IT'S A PLEASURE TO KNOW YOU was actually written by Karl Williams (not Carl) and the last line should be

"But friendship's a diamond, and trouble's the diamond mine."

Also, you might want to add the following note:

[Sung by Karl Williams on his album, "Living at the End of Time." Also sung by Sally Rogers on "When Howie Met Sally," and by Faith Petric on "Faith's Favorites."]