Thanks for the info, Val!
Sometimes I use the "chord diagram" above the staff when I play the piano! I am o.k. at reading piano music for the right hand, but terribly slow at reading music for the left hand, so sometimes I "cheat" and use the guitar chord diagram to make chords with my left hand to go along with the right hand melody! Now I guess I need to start using the chord diagram as it was intended...for the guitar!!