Experimental rock, also known as avant-garde rock or avant-rock, is a type of music based on rock music which experiments with the basic elements of the genre, or which pushes the boundaries of common composition and performance technique. Performers of experimental rock may also attempt to individualize their music with unconventional time signatures, instrumental tunings, unusual harmony and key signatures, compositional styles, lyrical techniques, elements of other musical genres, singing styles, instrumental effects, found objects, or custom-made experimental musical instruments. Experimental rock may involve extended techniques, prepared instruments, unconventional playing techniques, extended vocal techniques, and the use of instruments, tunings, rhythms or scales from non-Western musical traditions.