This song is insanely easy.

Carillon de Longpont, Louis Vierne.
Yes. I used to know it,but it's been like seven months since I played it. If it doesn't sound easy,look at this. It's basically a simple pedal mordant with some chords in the right hand.The left hands comes in later, but that part is pretty simple. The ending is kind of tricky though.
But I love it. Mostly because I was able to learn it by memory without sheet music.