Samaveda consists of a selection of poetry mainly from the Rigveda, and some original matter. It has two parts, Purva-Archika (First Adoratona) and Uttar-Archika (Later Adoration), containing verses addressed to the three gods Agni (Fire), Indra (King of Gods) and Soma (Energizing Herb). The verses are not to be chanted anyhow, but to be sung in specifically indicated melodies using the seven svaras or notes. Such songs are called Samagana and in this sense Samaveda is really a book of hymns.