Human: I'm a beginner at playing the piano. What are the keys on a piano? Assistant: 
The keys of a piano are arranged in a standard pattern, with white and black keys alternating from left to right. The white keys are called "notes" and the black keys are called "chords." Each key has two names - one for when it is pressed down (called the "root") and another for when it is not pressed down (called the "third").