SFM: We're the Ladybugs
The song is taken from a My Little Pony G3 Special: Pinkie Pie and the Ladybug Jamboree. I found the song at https://www.derpibooru.org/1966456
I discovered that Twilight Sparkle actually does have a fear of Ladybugs. Long ago, it once went away. But then it suddenly came back, and now she's freaking out. Starlight and the other girls attempt a dance for Twilight: with predictable results