准备三首试音曲目(风格不限)，不需要伴奏。
Prepare 3 songs without accompaniment. No limitation of music styles.
参赛作品必须是最近三年内创作的作品，风格不限。
The composition should be written any style and in last three years.
选手要使用现场指定的，由四个和弦构成的和声进行创作不少于四小节四轨的音乐片段，速度不限，风格不限。
The players shall create music segment not less than four sections and four tracks using site-specified, four-chord formed harmonies, at any speed and in any style.
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