Mozart was a ____ (作曲家). He wrote classical music and operas. ____(他的) music is difficult to play and sing. Musicians and singers ____(训练) for a long time before they can play and sing Mozart's music, ____(但是) pop and rock musicians don't train much. Their most popular instrument is the guitar. In America, black musicians often sing ____(悲伤的) songs. They call this music the blues. Another ____(种类) of modern music ____(来自) America is jazz. This music often ____(使用) trumpets and other loud instruments. We use____(钢琴)and violin to play ____(所有的) types of music.