on-key

He had to work out the letters on the keys.

But she had flung her hands on the keys again.

It's really the only way to have white labels on black keys.

He turned back to his word processor and began to beat on the keys.

He puts his fingers on the keys, ready to type.

It wouldn't have been so bad if Riley had sung on key.

Some of the wine has dried on the white keys.

Of course, being on key is not a prerequisite for fame.

When the piece came to an end, he kept his fingers on the keys as if the music still continued to flow from him.

Her hands stiffened on the keys as she heard the door open.