Task: Question Answering
Input (English): Passage: I sit down at the piano to play a piece of music . I open the music book to the page where the piece is . I put both my hands on the keyboard . I read two lines of music at the same time , one tells me how to move the fingers of my left hand , the other tells me how to move the fingers of my right hand . I have learned what the musical symbols mean , and I read the musical text ( which is called a score ) just like people read a book with words , but I am reading symbols that tell me where to put my fingers on the piano keyboard and how long to hold my finger on each key . The music also tells me whether I should hit the keys hard for a loud song , or softly for a soft sound . When I have read all the symbols on the page ( musical notes ) , I am finished playing the piano piece . Question: What must be kept? Option1: books Option2: The time as the piece is played.
Output (English): The time as the piece is played.