Madder Lake are an Australian progressive rock band formed in Melbourne in 1968 as San Sebastian. They were one of the first bands signed to the Michael Gudinski co-owned Mushroom Records which released their debut single, "Goodbye Lollypop" in February 1973, followed by the album Stillpoint in August. This contained their most recognisable single, "12lb Toothbrush". Their second album Butterfly Farm was released in April 1974, they left Mushroom after their last single, "I Get High" appeared in July 1976. A compilation album The Best of Madder Lake was released by Mushroom Records in 1978.