The Wikipedia article on Annie Ross is pretty comprehensive for anyone looking for more info.

Of course, textual information is not the point ~ my hope was to encourage anyone and everyone to see and hear young Annie's performance. It occurred to me to see if it might be available on YouTube and, lo and behold, "Our Gang Follies of 1938" was the very first episode that turned up when I searched YT and found a 42-minute
clip entitled "The Best of Our Gang Comedies":

http://www.youtube.com/watch?v=xbTZHNHF5fQ

This YouTube clip consists of TWO theatrical shorts ~ Follies-of-'38 first, followed by a much older episode from the twenties, entitled "School's Out." Both films are well worth watching if you can sit at your cmputer for 42+ minutes.

Annie's brief appearance starts at the 4:52 mark and runs for less than a minute. Still, it's more than a little impressive. When the camera moves in for a close-up shot during the third and final verse (i.e., the last 20 seconds or so), she's so freaking cute I could just about kill myself!