填空：Mozartwasacomposer.Hewrote______musicand____.Hismusicisdifficulttoplayandsing.Musiciansand______trainforalongtimebeforetheycanplayandsingMozart'smusic,but_____androckmusiciansdon'ttrainmuch.Theirmostpopular

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　　Mozartwasacomposer.Hewrote______musicand____.Hismusicisdifficulttoplayandsing.Musiciansand______trainforalongtimebeforetheycanplayandsingMozart'smusic,but_____androckmusiciansdon'ttrainmuch.Theirmostpopularinstrumentisthe______.InAmerica,blackmusiciansoftensingsadsongs.Theycallthismusicthe____.AnothertypeofmodernmusicfromAmericais______.Thismusicoftenuses____andotherloudinstrument.Weuse____andviolintoplayalltypesofmusic.