July 29th 1974, Mamas And The Papas singer Cass Elliot died in her sleep from a heart attack after playing a sold out show in London, England. She was staying at Harry Nilson’s London flat when she died. Her solo hits included ‘Dream a Little Dream of Me,’ which also featured the rest of The Mamas and The Papas and ‘It’s Getting Better’. Had also been a member of The Mugwumps.