Very easy to learn. It’s a quiet and repetitive song.
Useful if you wanna “impress someone”, as Dan says. =P
Hope you’ll enjoy ^^.

A beautiful and repetitive song.
The green notes play the singer’s voice.
Second Part here :
Second part

Full version of the First Opening of Ayashi No Ceres.
I’m sorry, there is only one colour, but I didn’t find any better midi file.
Don’t worry, it’s not difficult to guess what key you have to press with your right hand, and what key you have to press with your left hand.

This is Elton John’s version.