The Pop Life: When a rock group creates a distinctive new sound that takes it to the top of the best-seller charts, the last thing anyone wants the group to do is change. But the Police, the English trio whose third and most recent album was a million-seller in the United States and a worldwide hit as well, have never had much faith in the conventional wisdom of the music business. In l978 they promoted their first album, 'Outlandos d'Amour',' by touring America on a shoestring budget, riding with all their equipment in a single van. Instead of accepting the usual advance against royalties from their record company, A&M, the Police negotiated a contract guaranteeing them a higher royalty rate than is customary. If their records had been unsuccessful, they would have received little or no money. But their unusual decision proved extremely profitable for them: their second album went gold and their third went platinum...