A play on the term “gray matter,” the substance that makes up the brain, “Pink Matter” is a meditation on the female anatomy, desire, and fantasy.

The song features OutKast member André 3000, who also plays guitar on the track. The song almost featured Big Boi grabbing a verse, but after discussion Big Boi and André decided they couldn’t do an OutKast reunion on somebody else’s record.

The production, like the entire album, is handled by Frank, but he got help from his friend Malay. Malay told Complex about working on the record and the selection of André 3000:

It was just a simple thing. There came a point when we knew we were getting close to wrapping the record. Frank was kind of narrowing down who he wanted features from. We knew we didn’t want to make it a record full of a whole bunch of big name collaborators just for the sake of having them. We were just really trying to decide who we could bring to this project that’s going to elevate the overall project.

That record’s an incredible song and it’s a lot of people’s favorite record when they’ve heard the album. And with a name like that you’d think it’d be a single type song or something. But if you listen to it it’s probably the opposite of that. It’s that record that’s everybody’s favorite song on the album but it’s not the single. That’s showing where Frank really is at. He’s strictly doing it for the art. It’s not about, “Hey, this is going to help sales.”