Hi, In some piano music, you may have three different levels, as it were, e.g. > a melodic line in the treble, played by the right hand, a deep bass > consisting of long notes in the left hand, and in between chords filling in > the time between the bass notes, also played by the left hand. In such a > situation, which would likely involve large jumps of the left hand that may > even reach into the realm of the treble clef, the score is easier to read > if you distribute the notes played by the left hand on two staves and have > the line of the right hand in the third (uppermost) staff.
And sometimes four can be used, as in Rachmaninoff's Prelude in C# minor where the number of staves to a system fluctuates between two and four: http://javanese.imslp.info/files/imglnks/usimg/0/02/IMSLP00333-Rachmaninoff_-_Fantasy_Pieces_2.pdf Can't think of an example off-hand that uses more. -David
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