Antti Yrjö Hammarberg, professionally known as Irwin Goodman, was a Finnish rock and folk singer. He started as a protest song singer in the folk boom of the mid-1960s; his humorous songs, often mocking the authorities, became favorites of the Finnish people; Goodman singalike contests are still held by some pubs for entertainment.
Goodman's songs include "Poing poing poing", "Haistakaa paska koko valtiovalta", "Rentun ruusu", "Ei tippa tapa", "Työmiehen lauantai", "En kerro kuinka jouduin naimisiin" and "Tyttö tuli".