Tablatures
By definition, tablature is tied to a particular instrument and is not considered to be a general notation for all instruments. Both Klavar and Synthesia are examples of tablature for the keyboard. Tablatures are also available for stringed instruments (and a few others, like the harmonica), and guitar tablature is widely used. Developed to be alternatives to Traditional Notation, the idea is to visually map notes on the "tab" to fingers on the instrument itself; e.g., the keys on the keyboard or frets on a guitar.