Three is a crowd. Avoid having too many people present during inspections. It's best to show the home when no one is there. Then the prospective buyer won't feel like an intruder who wants to hurry through the house. If at all possible, keep pets out of the house.
Music is mellow.
But not when showing a house. Turn off the radio or television. Let the salesperson and the buyer talk, free form disturbances. Silence is golden. Be courteous, but don't force conversation.