few popular compositions (for example, "Blackbird" has a drone in the middle of a texture throughout the whole song, "Tomorrow Never Knows" makes use of tambura). They also used high drone for the dramatic effect in some sections of several of their compositions (like the last verses of "Yesterday" and "Eleanor Rigby"). Roy Ayers' Everybody Loves the Sunshine (1976) has a high sustained synth string note through most of the song. The rock band U2 uses drones in their compositions particularly widely. In the Led Zeppelin song "In The Light", a keyboard drone is used throughout the song, mostly in the intro. Use for musical training Drones are used by a number of music education programs for ear training and pitch awareness, as well as a way to improvise ensemble music. A shruti box is often used by vocalists in this style of musical training. Drones, owing to their acoustic properties and following their longstanding use in ritual and chant, can be useful in constructing aural structures outside common practice expectations of harmony and melody. See also Drone metal - a form of heavy metal music focusing almost entirely on droning, heavily downtuned electric guitar and bass guitar, often lacking vocals or drums. Jivari References Accompaniment Musical techniques Carnatic music instruments Indian musical instruments