... and they DID come over, and it was GREAT!CRS tip-- carry post-it notes. "Wildwood Flower? In A, right? I always... No? In D? Oh what's that chord change you added right there.... uh..... what's that... oh yeah...."
Scribble the chord changes on the post-it; fits anywhere; take 'em home and voila! Your own mini=songbook!
~S~