Over the weekend, performances done by Taeyeon when she appeared as a guest before a live audience on 'Sunny's FM Date' were uploaded online, showing her taking onSISTAR19's "Ma Boy" with DJ Sunny as well as her own OST, "Can You Hear Me," from drama 'Beethoven Virus.'

The crowd cheered as the two Girls' Generation members wowed with their synergy, chemistry, and singing skills.  Taeyeon then took things down to a slow tempo with her gentle ballad, serenading the crowd with her soothing vocals and expression of emotions.

Check out their performances below!