SANGATHI
11.1. One of the innovations of Sri Tyagaraja to improve the aesthetic beauty of Kriti –rendering was the Sangathi. A Sangathi (lit. putting together) is essentially a set of variations on the shades of a theme, gradually unfolding the melodic (Raga) potential of a phrase (Sahitya) in combination with Svaras. Some say that Sri Tyagaraja adopted Sangathi-rendering from dance-music where variations are done for Abhinaya and for bringing out the different shades and interpretations of the basic emotion (Bhava).
11.2. In any case, this was an outstanding contribution to the advancement of the Kriti format in particular and to the musical performances in general. Sangathi elaboration in Madhyama Kala, in the opening of a Pallavi, has enormously enriched the aesthetic beauty of Raga-bhava during Kriti-presentation in a concert. With that, a Kriti is no longer static; but, it is a vibrant, living entity like language that is wielded with skill and dexterity. Sangathi passages also mark the virtuosity of the performer. Some of Sri Tyagaraja masterpieces open with a cascade of Sangathis (E.g. Chakkani raja margamu; Rama ni samana; O Rangashayi; and Naa Jivadhara.)
11.3. Though the Sangathi was fundamentally a feature of Tyagaraja-Kritis, its practice (Sarasa-sangathi sandharbhamu, as Tyagaraja calls it) has now spread to the presentation of Kritis of Dikshitar, Shyama Shastry and other composers, though they belong to a different style. Similarly, Madhyama kaala that goes with the Sangathi has come to be the principal tempo of Karnataka Samgita [though some of Dikshitar-kritis, in Vainika style, are in slow tempo (Vilamba Kala)].
11.4. Sangathi and Neraval (sahitya vinyasa) – where the Sahitya and its melody is spread out in various ways while keeping intact the original structure of the Pallavi or Charanam – together with Kalpana Svaras, provide depth and expansiveness to Karnataka Samgita. And, Tyagaraja-kritis, in particular, provide ample scope not only for elaboration on various phases and aspects of Raga (manodharma-samgita), but also for improvising fascinating sequences of Sangathi-s, Neraval and Kalpana –Svaras.