The phrase "a soft tenor" is correct and usable in written English.
It can be used to describe a type of voice or sound that is gentle or soothing, often in the context of music or singing.
Example: "The choir's performance was highlighted by a soft tenor that captivated the audience."
Alternatives: "a gentle tenor" or "a mellow tenor."
He speaks in a soft tenor, as opposed to the mellifluous bass of the archetypal pol.
He speaks in a soft tenor, often tucking his chin and leaning toward his interlocutor — if he wore glasses, he would be constantly peering over them.
He was a Buddhist, an Iowa corn-belt kid, a classical musician, an avant-gardist and a pop singer-songwriter with a soft tenor croon.
Mr. Picker sings in a soft, quivering tenor that can slide imperceptibly into falsetto — he's the essential embodiment of vulnerability — and most of his songs come scaled for dramatic effect, with swooning strings, harp and brass.
Monteverdi's Hor che'l Ciel e la Terra e'l Vento Tace brought with it a sense of rapt introspection and some immaculate high, soft tenor singing as its initially serene landscape gradually became strewn with dissonant emotions.
Abner's soft tenor oozes rich, elegant timbres exuding a palpable glaze of energy and emotion.
The high soft tenor solos at the end, placed against a droning bass accompaniment, were haunting indeed.
You can see why they trusted the man with the camera; in his perennial jeans and sneakers, and with the soft tenor of his voice, Penn is apparently, at the age of eighty-four, the model of courtesy, and, according to Maria Morris Hambourg, who curated the show at the Met, his New York studio is so efficiently ordered that it is known to some as "the hospital".
Cleaning off the table before dessert, Freddie Powers, an excellent soft-tenor Texas singer who has worked with both Mr. Nelson and Mr. Haggard, sang "I'm Gonna Sit Right Down and Write Myself a Letter".
"Can She Stay" begins with a soft, elegant piano, followed by Sy's dulcet tenor.
Mr. Corig liano's setting, for tenor and nine instruments, commissioned by the society, has a soft, en gaging air of fantasy about it and its scoring is subtle and pinpointed.
