Taeyeon

Taeyeon, Girls' Generation's lead vocalist, has built a solo career that dwarfs most full groups, with her 2015 ballad "I" reaching number one across all major Korean music charts and accumulating over 100 million streams. Her four-octave vocal range and emotional control make her the benchmark for ballad performance, outperforming #3 Sunmi in sustained vocal complexity across albums. Since her solo debut, Taeyeon has released six studio albums, each setting first-day streaming records—her 2022 release "INVU" broke the record for a female soloist with 700,000 unique listeners on its debut day. This consistency cements her as a standard-bearer, though her genre range is narrower than IU's.