Na, one of China’s most influential female singers, performed “Curved: A practical reader guide

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Authorities in the southwestern Chinese city of Chengdu granted a rare exemption to a singer on Tuesday after she added an unapproved song to her set list at a weekend concert, drawing renewed attention to China’s tightening controls on entertainment.

Singer Na Ying’s performance was “a brief, fragmentary performance during an audience interaction segment rather than a full rendition of the song” and therefore did not require additional approval, the Chengdu Municipal Bureau of Culture, Radio, Television and Tourism said in a statement.

Her voice trembled as she sang. A professor of music history, Liu taught at the university for more than three decades before retiring. The Chengdu decision came weeks after authorities in the central Chinese city of Wuhan fined one of the country’s best-known comedians for changing the lyrics of a patriotic song during a performance.

Liu, one of China’s best-known musicians for nearly four decades, died Friday at age 63, according to an obituary published Sunday by the University of International Business and Economics. Liu performed the theme song for the 2008 Beijing Olympic Games with soprano Sarah Brightman during the opening ceremony.

Na, one of China’s most influential female singers, performed “Curved Moon” at her concert in Chengdu on Saturday in memory of her friend and singer Liu Huan, a household name who died the previous day. “I want to sing a song he sang before on this stage, to pay tribute to him,” Na, dressed in black, told the audience, according to videos posted on social media.