The modern concert format (kaccheri paddhati) as we know it evolved in the earlier part of the 20thcentury. The format consists of several compositional varieties like varnams, kritis, pallavis, padams,javalis, tiruppugazhs and so on. However, in addition to these largely preset parts of the concert, there arealso creative and improvisational forms, namely raga alapana (expositions of raga without rhythm), neraval(extempore melodic and rhythmic variations of specific lines in a composition) and swarakalpana (singing ofsolfa or swara syllables, often with rhythmic embellishments). Both of these components of modern Carnaticmusic owe much to Tyagaraja, undoubtedly the most influential vaggeyakara or composer in the annals ofCarnatic music.