The speaker notices "his ebony hands on each ivory key."

"With his ebony hands on each ivory key" evokes the duality of black and white.

"We replaced the soundboard, but it still has the original ivory keys," he said.

In the cozy sitting room he found Diana at the piano, her fingers moving dreamily over the ivory keys.

He frowned, reached out to caress ivory keys.

She was so beautiful, her graceful hands caressing the ivory keys with tenderness.

It has ivory keys, which newer pianos don't.

Nearby stood a piano, violently bereft of ivory keys, steel strings pulled out and broken.

Young Adam started learning piano when he was 4 and wrote his first piece at 8, scratching into the ivory keys which notes to start on.

She'd had a piano teacher whose breath was so bad the ivory keys turned yellow.