For many in the recording industry, the relationship between music’s business and artistic elements is an uneasy one. The lyrics of hip-hop or alternative rock, for example, often question the commercial value of popular music. Both genres are built on the assumption that musical integrity requires a complete separation between business and art. But, in fact, the line between commercial success and artistic expression is hazier than simply arguing that the business side is driven by commercialism and the artistic side is free of commercial concerns. The truth, in most cases, is that the business needs artists who are provocative, original, and appealing to the public; and the artists need the expertise of the industry’s marketers, promoters, and producers to hone their sound and reach the public. And both sides stand to make a lot of money from the relationship. But such factors as the enormity of the major labels, and the complexities of making, selling, and profiting from music in an industry still adapting to the digital turn, affect the economies of sound recording (see “Tracking Technology: The Song Machine: The Hitmakers behind Rihanna,”).