Jean-Pierre Massiera, sometimes referred to by his initials JPM, was a French musician, composer, record producer, sound engineer, and recording studio owner. His prolific output between the 1960s and 1990s ranged across pop instrumentals, psychedelic rock and disco music, often incorporating elements of musique concrète, field recordings and samples in an eccentrically experimental and unique style. His work is usually credited under one-off band names such as Les Maledictus Sound, Horrific Child, and Herman's Rocket.