The Shake It Off hitmaker criticised Apple Music executives in an open letter, accusing them of failing to offer artists royalties during a planned three-month free streaming trial for subscribers.

Apple chiefs subsequently backed down and agreed they had made an error of judgment, and would be paying artists for their work.

The move appears to have appeased Swift, who is now throwing her support behind the streaming service, which launches next week (30Jun15).

In a series of messages on Twitter, she writes, "After the events of this week, I've decided to put 1989 on Apple Music... and happily so.

"In case you're wondering if this is some exclusive deal, like you've seen Apple do with other artists, it's not. This is simply the first time it's felt right in my gut to stream my album. Thank you, Apple, for your change of heart."