Have you ever wondered who Michael Phelps listens to before jumping in the pool? During Michael Phelps final race before retirement, the most decorated Olympian in history led the United States to victory in the 400-meter medley relay.

Phelps finished his career that spanned over five Olympics with 23 gold medals and 28 medals in total. No other athlete in any sport has more than 9 gold medals.

So how does Michael Phelps pump himself up for these incredible races?

“The music that I’ve been listening to this time around…I’ve got some old school hits. I’ve been going out to some old-school Eminem when I get to the pool, and then I change it up to… Nero and Skrillex “Promises”…EDM,” said Phelps. “Got some old-school [Steve] Aoki in the mix from 2008…”

Watch the full video interview here.