Essence

Essence is a term referring to the musical instrument an Onponne is specially connected to from the moment they are born. In rare cases, an Onponne may be born with an Essence that is connected to a music-related object that isn't actually a playable instrument. Onponnes like this are known as disabled Onponnes.

An Onponne is naturally talented at playing their Essence instrument, and hearing the sound of their Essence normally boosts their spirits. Normally, Onponnes are loosely named after their Essence, but some Onponne parents choose not to follow this tradition. When a song plays from an Onponne's heart (Heart Tune), it's in the sound of their Essence.

Multiple Onponnes can have the same type of instrument for their Essence. Furthermore, their Essence may be a general kind of instrument or a very specific instrument. For example, Peony's Essence is the piano, meaning that she is naturally talented at playing any type of piano. However, Gracie's Essence is the grand piano, meaning that she is only naturally talented at playing the grand piano but not other kinds.

Onponnes are capable of learning other instruments besides their Essence one.