Honestly, I prefer Pinkie's singing voice to her normal voice.
She just sounds so much kinder
For me it's ruined by knowing that it's the same voice as
Misa Amane. Considering how similar they are in their
Ping Pong Naïveté, maybe this is why it became so popular to paint Pinkie Pie as a serial killer.
I would pin "Evil Enchantress" as the surest bet for being sung by Andrea Libman, since not only is it very short, but it wasn't meant to sound all that "good" anyway. Or maybe she sang all the songs that weren't worthy of being listed
here
? One other observation I had about Pinkie's speaking voice as I was reviewing those is how she gets so excited right before singing "Pinkie's Gala Fantasy Song", she starts to sound like Russi Taylor, who was in the original My Little Pony series!
This one's even worse! How is that possible you ask? Well it's partially because the animators FORGOT TO ANIMATE THE MOUTHS!
I think this was an unfinished version; it's also missing sound effects, and the end credits are from "Pinkie Pie's Special Day". (The main idea is that Sweetie Belle does random magic whenever she burps, and it's kinda lost without all that.) I couldn't guess where this Youtuber happened to find an in-progress copy of the cartoon, though.
And to be honest, I've been soured on watching this "Bronies watch" stuff when I know the video they're watching has problems that are the fault of the uploader and not the original production—like when they did the version of "A Very Minty Christmas" from
Wish Faerie's account with the missing scenes, even though The Hub's website lets you watch the whole movie in good quality for free.