Decent work
The lipsynching was fine, in my opinion, but a few things got on my nerves. Firstly, the looping of a lot of things were off (like the building lights) and the motion tweening. Too much of it. Such as:
The ground the guy walks on for the WHOLE of "Go West" and "Somewhere Over The Rainbow" (yes, emphasis on the whole, since I thought you were going to do that for all the rest, which you fortunately didn't).
In addition, when things were stretched, it wasn't... awesome to look at. Like the pikachu, for example. He wasn't just drawn thin, he was quite obviously squashed. If necessary, just make him "normal" then obscure the pokeball a bit. It's worth covering it.
But overall, it was a pretty nice piece. Looking forward to future ones!