Try the interactive tutorial, or download the Sheet music here: musescore.com/user/29879711/s...
I made this piece for piano solo, but after applying reverb I realized that adding a celesta would sound good. The celesta can be removed for the score without problem, or replaced by other instruments, such as the kalimba.
I normally dont compose in C major, but this simple chord sequence sounded amazing with the added 9.