Teng's singing style conveyed simplicity and sincerity. Yeh Yueh-Yu, a professor of Cultural Theory at the University of Southern California said, "It was the sweetness in her voice that made her famous. She had a perfect voice for folk songs and ballads, and she added traditional folk song stylings into Western-style compositions." Her voice was also described as being "like weeping and pleading, but with strength, capable of drawing in and hypnotizing listeners." Songwriter Tsuo Hung-yun said Teng's voice was "seven parts sweetness, three parts tears."
A rare Youtube English interview with Theresa in 1982 (sorry, unable to embed)
When will you return (Japanese)
A comment on Youtube: What an Angel, what a voice..........so pure, beautiful...I'm a 61 y/o Texas cowboy, don't speak a word of any Asian language, but love this dear lady with all my heart. She makes me love my Asian brothers and sisters, world wide. She died way too soon, but left a lasting legacy that few if any, ever do...God bless her, and may her beautiful music live on for eternity,blessing, comforting all who are suffering.