From the sounds of things, I think Amy's just been part of the writing team for his music. Fingers crossed she'll be singing, but that's not the impression I get from the post.
Highly doubt when someone invites an incomparable singer like Amy to a project, it's for writing the music. I actually think it's totally opposite and she wouldn't be involved in writing the music much when it's another artist's project but let's wait and see!
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