Harvey Phillip Spector was an American record producer and songwriter, best known for his innovative recording practices and entrepreneurship in the 1960s, followed decades later by his two trials and conviction for murder in the 2000s. Spector developed the Wall of Sound, a production style that is characterized for its diffusion of tone colors and dense orchestral sound, which he described as a "Wagnerian" approach to rock and roll. He is widely regarded as one of the most influential figures in pop music history and one of the most successful producers of the 1960s.