How do you transpose piano key to cello key?

To transpose a piece of music from piano key to cello key, you need to:

1. Identify the key of the piece in piano key.

2. Determine the interval between the piano key and the cello key.

3. Transpose the notes of the piece by the appropriate interval.

For example, if you want to transpose a piece from C major in piano key to A major in cello key, you would need to:

1. Identify the key of the piece in piano key as C major.

2. Determine the interval between C major and A major as a minor seventh.

3. Transpose the notes of the piece by a minor seventh by moving each note up seven half steps.

This would result in the piece being transposed from C major in piano key to A major in cello key.