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Application of ‘Physics of Music’ to ancient Tamil grammar text ‘tholkAppiam’ and other ancient Tamil texts led to the discovery of ‘Musical Linguistics’ (‘Musical Phonetics in Tholkappiam’ in the journal of the international institute of Tamil studies; December 2013 http://www.ulakaththamizh.in/journal )
From the above discovery, the sound of letters had dual aspects; one serving the semantic goal in prose and speech, and the other serving the non-semantic musical goal in musically rendered song.