சுருதியும் லயமும் ஒன்று சேர… : shruti petti !!

 

லம்போ3த3ர லகுமிகர  !  அம்பா3ஸுத அமரவிநுத 

Lambodara lakumikara; ambaa suta amara vinuta

lambodara lakumikara

 

Those who lived in Triplicane half-century will know the names of Saraswathi Gana Nilayam, Smt GP Kamala, Smt. Chandra teacher and more .. .. young girl children would be sent to them for learning Carnatic music and one would hear, singing in various voices – lambo dara …. Laku mi … !!.  This famous song of Purandara Dasaru,  perhaps was the first song for aspiring musicians to learn singing .. .. 

Before you read further – can you associate ‘Bellows’ – primarily a device to expel a controlled blast of air to Carnatic music !!  

The first fatlering  step is to sing in unison with the shruti, beginning with Sa-Pa-Sa (the tonic and the fifth). This simple exercise helps  voice lock into the pitch of the drone. A good way to check aspirant Singer’s  accuracy is to sustain the “Sa” for as long as possible and listen carefully. If   voice wavers or feels unstable, try making small, controlled adjustments. Over time, this will improve your sruti shuddham (pitch purity). 

In every Music class, the teacher would harshly say -   “First, align your voice with the shruti.” What would  that really mean?  That is better tried with a Shruti Box.  For many beginners, singing with a shruti box feels confusing at first  !!  A shruti box is more than just background sound; it’s a constant companion that trains your ear, refines your pitch, and strengthens your grasp of ragas. In essence, it is believed that the humm of the “surpeti” helps the performer channel the humm of the universe through them.   

A shruti box (sruti box, shrutibox, srutibox or surpeti) is a musical instrument, originating from the Indian subcontinent, that traditionally works on a system of bellows. It is similar to a harmonium and is used to provide a drone in a practice session or concert of Indian classical music.  It is used as an accompaniment to other instruments.   In classical singing, the shruti box is used to help tune the voice. The use of the shruti box has widened with the cross-cultural influences of world music and new-age music to provide a drone for many other instruments as well as vocalists and mantra singing.  

Adjustable buttons allow tuning. Nowadays, electronic shruti boxes are commonly used, which are called shruthi pettige in Kannada, shruti petti in Tamil, Malayalam, and Telugu, and sur peti in Hindi    

Understand that in  Carnatic vocal music, there is no universal pitch—each singer has a natural sruti that complements their voice, and half the journey is finding it.  Before the arrival of the harmonium in the Indian subcontinent, musicians used either a tambura or a specific pitch reference instrument, such as the nadaswaram, to produce the drone.  Now there are two main types of shruti boxes:

•           Manual (Reed-Based) Shruti Box: These work like a harmonium, producing a warm, organic sound through air reeds. While traditionalists prefer them, they require more effort to tune and maintain.

•           Electronic Shruti Box or Shruti Apps: Most modern vocalists use electronic shruti boxes or mobile apps. These provide precise pitch control, allow multiple drone settings (Sa-Pa, Sa-Ma), and are easier to carry around.  

Bellows are a device constructed to expel a controlled blast of air. The simplest type consists of a flexible bag comprising a pair of rigid boards with handles joined by flexible leather sides enclosing an approximately airtight cavity which can be expanded and contracted by operating the handles, and fitted with a valve allowing air to fill the cavity when expanded, and with a tube through which the air is forced out in a stream when the cavity is compressed.  It has many applications, in particular blowing on a fire to supply it with air.

 

Sure have heard this song from Salangai Oli set to the tune of Isaignani Ilayaraja

தகிடததிமி தகிடததிமி தம்தானா…

இதய ஒலியின் ஜதியில் எனது தில்லானா…

சுருதியும் லயமும் ஒன்று சேர…

 

In Indian classical and Carnatic music, Sruti (pitch) and Laya (rhythm) are the two foundational pillars.  Sruti refers to the exact, fundamental musical pitch or microtone. It is the smallest interval of sound that the human ear can differentiate and a singer or instrument can produce.  It is traditionally maintained in the background using a drone instrument, such as a Tanpura or an electronic Sruti Box.  Laya is the rhythm, tempo, or pulse of the music.  It is kept steady by counting, tapping the hand, or keeping time on a percussion instrument like the Mridangam or Tabla.  

 

This Shruti petti attracted me yesterday and here is a short video:  https://youtu.be/yVlLYdDwl0w  of Nadaswaram vidwan performing and carrying a Shruti box along at the time of Thiruvanthikappu at Sri Parthasarathi Swami thirukkovil – Vaikasi Ekadasi purappadu on 27.5.2026

 
Regards – S Sampathkumar
28.5.2026