The helps/songs are presented in color and design in a way that helped me who has poor eyesight. The internet has many websites with free music and free help/instruction on how to play the Harmonica.
Category: Music
There are great Ocarina websites that give online instruction for playing the Ocarina in various holes and shapes. There are many free sheet music sites for the Ocarina too.
The songs/diagrams/info on this website are the ones I used as I am a beginner [not expert] player who has poor eyesight and problems with my hands/fingers [handicapped] and still want to play the instrument. When I get more acquainted with the instrument, I plan to use some of the online helps myself.
Also, I had to pick a design of Ocarina that worked better with my hands in shape and weight of instrument.