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The melodic element of twentieth-century music can be described as Imitative of instrumental character, with the techinal advances new approaches are given and the music language start changing, human voice is treated as an instrument , the ring melodies appear, and musicians start exploting the value of history and culture and including them to music.
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Mystic Seaport is my best answer. Hope this helps
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Metronomes can be useful for improving chord changes
