He thinks that music lessons can make him relax.
楼上各回答者的句子翻译过来应该是：他认为音乐课程是放松的，课程成为了主语，没有主语他。
He believes that music lessons can relax him.
He thinks that music lessons can relax.
He thinks that Music can relax.
He thinks that music lessons can be relaxed.
He thinks music is a relaxing class.
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