Which statement best describes Gregorian chant?

Which circled letter is indicating a ledger line?  

Which musical term can be define as two or more notes played at the same time?

Which circled letter is indicating a flat sign?  

Which woodwind instruments are usually made of metal – contrary to their family name?

Audio example ?VxJw3wfC56=1748012981&Kq3cZcYS15=8b73988c51f7418794add232722274a2&Kq3cZcYS15=8b73988c51f7418794add232722274a2&VxJw3wfC56=1748012981&3cCnGYSz89=KRDGSSmzcAkbwKMrxTJEbOLy8a0yTIooHgx%2FImrf6Bg%3D#1 is which piece from the list of musical selections below?

Which instrument is NOT a member of the string family?

Audio example ?VxJw3wfC56=1748012981&Kq3cZcYS15=8b73988c51f7418794add232722274a2&Kq3cZcYS15=8b73988c51f7418794add232722274a2&VxJw3wfC56=1748012981&3cCnGYSz89=KRDGSSmzcAkbwKMrxTJEbOLy8a0yTIooHgx%2FImrf6Bg%3D#12 is which term from the list of musical terms below?

Which circled letter is indicating a ledger line?  

Which of the following is a characteristic of Baroque music?