Taylor Swift Just Performed A Song She Wasn't Sure She'd Ever Sing Live

Lady Gaga's One World: Together At Home concert special was full of emotional moments -- but Taylor Swift's appearance was particularly poignant.

You see, Taylor performed Soon You'll Get Better, a song she wrote about her mother Andrea's battle with cancer. Swift had previously told news outlets it was so emotional that she couldn't even listen to it, and wasn't sure she'd ever sing it live.

Grab some tissues and check it out below.