Producers in Pop music plays a critical role. They are the one to decide the style of album, songs that go in the album, arrangement of music and maintain the quality. Many singers are only front man, they don't participate in all these decision. Whitney Huston is a big star, however, she doesn't own any right of those songs she made them famous. George Martin, unknown to many people, was the producer of most Beatles' albums. He was the one who make Beatles musically successful. So when you talk about pro in music industry, look beyond the front man.