The other way around

The shores responded in song to the waves.

She bit her lip. “What?” her father asked.

“It’s off beat.”

He squinted. Her father needed glasses, but he refused to admit it. “Since when?”

She shrugged and looked out at the waves.

“I thought the waves caused the song, not the other way around.”

Her mouth worked around nothing. She had no words. It was true. The beat of the waves caused the song. So if it was off… where was the music coming from?