Playing, Part 1 · Chapter 3: Notation and Rhythms

The Grand Staff

Fasten your seat belts… now it's time to join the treble and bass clefs together to create what is known as the grand staff. This is normally how piano music is written, with the right hand playing the treble clef part, and the left hand playing the bass clef part. Notice there is now a line connecting the two staffs (or staves) together, and also a bracket is added, signifying that they are “grouped” together.

All About Piano — figure from page 22