On the 22nd broadcast of ChinChin, Taeyeon sings a duet with Jeong Joonil and the song is Promise by Hwayobi and Naul.
credits; jnd402
Tae always seems to sing with such passion in my opinion. Both the singers voices go quite well together (:
Taeyeon Promises Us
22 Saturday Aug 2009
Posted in Videos
SNSD Korean 
taeyeon’s voice is really beautiful….. it soothes me when i hear her sing….. ^_^
awww. they sound so nice together. i always love hearing taengoo singing. her voice is so sweet. ^_^
The two still pictures are amusing. TaeYeon conscientiously posing — while JooNil is distracted.
I quit listening to the song. They really needed more practice. And the song was tuneless.