Without a Key, In Music is an ATONAL musical composition. ATONAL music is a type of music that does not have a tonal center or key. It is composed of notes that are not related to any particular key or scale. This type of music is often used in experimental and avant-garde compositions. It is also used in film scores and other types of media. ATONAL music can be used to create a sense of tension and unease, as well as to explore new musical ideas.