Michael Phelps revealed the song he was listening to when he pulled his iconic 'Phelps Face'

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Michael Phelps introduced Future at the VMAS.

We finally know what Olympian Michael Phelps was listening to when he made his meme-ified "Phelps Face."

During the Rio Summer Olympics, Phelps was doing his normal pre-race routine before the 200-meter butterfly when South African swimmer Chad Le Clos - who had narrowly beat Phelps for the gold medal in the same event at the London Olympics in 2012 - began shadow-boxing in front of him. 

Phelps, listening to music with his hood up, gave Le Clos the ultimate death stare. This amazing face was captured on live television:

NBC

Phelps made this now-famous face during the Rio Olympics.

It inspired a string of memes:

The face is still one of the most memorable Phelps moments from this year (aside from the way he reacted to Jimmy Fallon's Ryan Lochte impression).

On Sunday, the swimmer attended the MTV VMAs where he introduced the rapper Future: "There's no rapper today more inspiring than Future. His optimism is right there in his name," Phelps told the crowd.

Then, he explained he was actually listening to Future's music when he made the iconic and viral "Michael Phelps Face."