Sama Veda

Traditionally considered the second of
the four Vedas, the oldest and most
authoritative Hindu religious texts. The
Sama Veda is a collection of hymns,
arranged for singing as one of the components of the Vedic sacrifices (yajna).
While drawn mostly from the Rg Veda,
the singing patterns are far more elaborate than the simple chanting generally
associated with the Rg Veda. Thus it is
believed that the Sama Veda developed
later than the Rg Veda.