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Yu Junjian national singing method Q&A 131 cases folk song Yu Junjian vocal notes writing Bel Canto Singing The floral fragrance of the flower basket
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Yu Junjian national singing method Q&A 131 cases Bel Canto Singing folk song writing
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Yu Junjian national singing method Q&A 131 cases Beijing Publishing Group commonweal Small poplar
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