This song was the first record that she cut for the album, Burns says.

This is what shaped the sound of the rest of the record as far as I know.

[Her team was] looking for something completely different from what she normally does.

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This time, in pursuit of a more hip-hop and R&B-oriented sound, Spears explored her options.

She was open and didnt set any boundaries, says a source close to the project.

This album is diverse and fresh and is a reflection of Britneys versatile taste in music.

Shes such a legend, he says of working with Spears.

It wasnt like I had to direct as much as normal.

Nick Monson:He got his big break co-producing several tracks on Lady Gagas 2013 album,ARTPOP.

She also once co-produced a Drake song, Over My Dead Body, from 2011.

Mattman & Robin:Another hit Swedish production group.

it’s possible for you to thank these two for helping make Carly Rae JepsensEMOTIONa masterpiece.

BloodPop:He worked on several songs on Justin BiebersPurposealbum, including the smash Sorry.

He and Grimes also teamed up forGo,a one-off banger from 2014 that was originally written for Rihanna.

Robopop:Like many on this list, Robopop a.k.a.

Daniel Omelio has also worked with Nick Jonas.

He co-produced Spears new songClumsywith Alex Nice.