Imogen Heap helped Taylor Swift build the final song on 1989 — "Clean" — in a one-day recording session that also included "lunch, dinner and chat," according to Heap.

The UK singer recently published an extended blog post detailing her experience with the international superstar.

"I have to be honest here and say I had ever so slightly not done my homework on Taylor Swift but had done what I HATE others do of me, which is to pre-judge a person based on assumptions," Heap wrote on her website. "I had assumed Taylor didn't write too much of her own music (as is the case with many young, extremely successful artists these days who sell shed loads of records) and was likely puppeteered by an ageing gang of music executives, working to formulas and spread sheets."

Obviously, Heap was misinformed.

"How wrong was I?" she wrote. "Totally clued up from a very young age (I had not idea what a publishing label even was at the age of 14 never mind moving my family to Nashville so I could pursue a song-writing career!), hyper driven, hard working, really talented and a genuine lovely soul, with a few more boy troubles than most but you can't get it all right all the time!"

The "Hide and Seek" singer also shared an email Swift sent after the musical rendezvous.

Imogen,
I've listened to Clean over and over and I can't thank you enough for today. It was one of the musical highlights of my life watching you work. This will be such a special song on my album and I'm so happy this all came together. Hope to see you at a show and if not, I'll come visit the next time I'm over there!
Taylor

Swift released 1989 on Monday, and it will most likely be the only platinum effort from any artist in 2014. Friday, she announced "Blank Space" would be the newest single from the album.

We gave the track a quick review last week.

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