peter warlock (born london, 30 october 1894; died london, 17 december 1930), was an english composer. “peter warlock” was not his real name. his real name was philip heseltine. he was also a music critic. when he wrote about music he used his real name, but when he composed music he used the pseudonym (borrowed name) "peter warlock", which is the name by which he is usually remembered today.