That separates or distinguishes; -- applied to points or marks used to distinguish letters of similar form, or different sounds of the same letter, as, a, ã, ä, o, o, etc.
Diacritical is a Washington DC based experimental rock band officially formed in 2004. They define their sound as rock that’s influenced by concepts from music all over the world. Ideas like drone and linear improvisation, scales and modes from other cultures, Call and response (music), polyrhythmic grooves and odd time signatures.