1585 – c. 1628) was an Italian composer, music theorist, and member of the Somaschi Fathers.
[1] Giovanni Battista Rossi was born in an unknown year in the city of Genoa.
His music treatise Organo de cantori per intendere da se stesso ogni passo difficile che si trova nella musica, et anco per imparare contrapunto was completed in 1585 but not published until 1618 in the city of Venice.
Also published in Venice, was Rossi's choral setting of the Magnificat in 1618, and a volume of four-part masses in 1628 entitled Threni Ieremiae Prophetae, super voces Gregorianas, & miserere.
It is uncertain whether or not this was music written by the Somaschi Father or by another person of the same name.