When Apple first launched Apple Music, singer Taylor Swift refused to allow her album 1989, which had been the bestselling album of 2014, to be made available for the service because Apple did not intend to pay royalties on songs it streamed during an initial three-month period when the service would be free to subscribers. In response, Apple changed its policy and agreed to pay royalties during those three months, even though doing so reduced its profit. Do singers typically have substantial bargaining power with Apple, Spotify, and the other streaming services? Briefly explain.