Answer:
<h2>D.Two staves together</h2>
Explanation:
The Grand Staff is used for piano music and has two staves of five lines that are connected on the left with a brace. The bar lines are drawn through both staves and the space in between them. The top staff uses a treble clef, or G clef, and the bottom staff uses the bass clef, or F clef.
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The introduction of Bach to music had quite an impact. Before Bach, many were ill - tempered and most became well - tempered after Bach. Harmonically speaking, Back's composition were way ahead of time. He introduced unexpected chord changes. He also initiated the keyboard technique that is still used up to date.
