What's the idea of release singles after albums?

[Mad_Cactuar]

Yeah that I realized too. Even camera's and various edible products get their own tie-ins. In the US, nothing of that sort has happened on a large scale. I only know Gwen Stefani designed some camera, but it didn't have a tie-in. Maybe songs get overplayed in the US anyway, so they don't put songs attached.

However, I don't believe star power in the US isn't enough to promote products. Surely there's something holding artistes and companies back.