Last month, free solo star Alex Honnold stunned the world with a rope-free climb of Taipei 101 — a 101-story skyscraper in Taiwan — broadcast globally on Netflix.

But beyond the sheer physical feat, Honnold also drew attention in the music world: he soundtracked the ascent himself, curating a playlist largely made up of Tool tracks.

Speaking to Variety, Honnold explained that his playlist wasn't just motivational; it also helped him maintain a steady pace during the climb.

'It was mostly Tool,' Honnold said.

'It's a random playlist that I made, that I shared with production.

I made it months ago while I was driving.

I've been training to it a bunch.

Basically, rock music that I've liked my whole life.

Part of the appeal of music is that actually it helps me with pacing.' The playlist has since been shared online and features cuts from Tool's albums Ænima, Fear Inoculum, and Lateralus.

Other notable selections highlight Honnold's taste for intense rock and metal.