Ketty Lester emerged as a distinctive voice in American popular music during the 1950s and 1960s, bringing jazz inflection and emotional depth to standards and contemporary songs. Her interpretive approach emphasized lyrical storytelling and subtle phrasing, qualities that made her recordings influential among singers interested in the intersection of jazz sensibility and traditional song forms.
Lester's work has been revisited and reinterpreted by subsequent generations of jazz artists, most notably Diana Krall, whose piano-vocal recordings drew from the interpretive tradition Lester helped establish. The song "Love Letters" remains a touchstone for understanding how jazz musicians approach the Great American Songbook.