About the Grand Staff by: David from www.piano-play-it.com
Hey Mike,
Let me make it clear for you. First, I suggest you follow the Grand Staff piano lesson if you haven't done so yet.
The upper staff is for the RIGHT HAND and the LOWER STAFF is always for the LEFT HAND.
It doesn't neccesarily mean that the left hand will always be playing the bass and that the right hand will be playing the melody.
It is possible to play both the melody and the chords with the right hand for example. In this case both the melody and the chords will be written on the upper staff.
Sometimes we'll be only accompanying a song on the piano for example. The melody will be sang by a singer. In this case the bass will be played and written on the lower staff (for the left hand) and the chord will be written on the upper staff (for the right hand).
Sometimes we might even play a chord that is spread through out the piano and the the bass and another note of a chord will be written on the lower staff (for the LEFT HAND again) while the upper staff (RIGHT HAND) will be playing the remain voices of the chord (Have a look at the Shell Voicings lesson to see an example.
Now it's true that in some piano sheets, which are written for voice and piano you'll see three staffs. In this case the the melody is written in the upper staff for the singer (With the lyrics bellow) and the two lower staffs are written for piano (Right hand and Left hand respectively).
Is this now clear? I hope so... Let me know if you've got further questions o.k.?