Electronic tanpura
An electronic tanpura is an electronic instrument that replicates the sound of an Indian string instrument known as the tanpura, used to provide a constant drone to accompany another's vocal or instrumental melody.
Terminology
It may also be called an electronic tambura, electronic shruti box, or simply shruti box. Nowadays it is available in mobile phones.Function
In Indian music, the drone is a basic function of the music. The development of a raga, any composition or song within raga presupposes and requires the continuous sounding of the key-note, its octave and another tone, usually the fifth or fourth. Traditionally drone is often provided by one or more tanpura player, especially for vocal performances.The electronic tanpura was created as a marketable, practical solution for instrumentalists, having their hands otherwise engaged, who cannot readily avail themselves of able tanpura players for their long hours of private practice. Generally, the electronic tanpura has one or more dials to control the tone and volume, and may have other switches and buttons that allow a certain pitch and volume to be saved and used again at a later time. The range is usually one to two octaves.