Music has three clefs , the C , F and G clofe . Most music for the piano , guitar and harmonica uses the G and F clefs

• 乐谱有三种首音符号，C（调）符号、F（调）符号和G（调）符号。大多是钢琴、吉他和口琴的乐曲用F（调）符号和G（调）符号。