Sruthi Box (Sruthi Petty), an Indian drone instrument, has two basic forms - one is manual and other is electronic. It is similar to the
Harmonium but lacks the key board. The instrument is used to provide drone in concert or for practice, and it provides three basic notes.
This accordion shaped instrument allows air to pass through an enclosed space to produce sound. Hindustani musicians and Carnatic musicians are the regular users of this instrument.
Sruthi Box is also known in different names such as Swar Pethi, Swar Peti, Swarpeti, Surpeti, Sur Peti, and Sruti Box.
