Rage Against The Machine and Audioslave guitarist Tom Morello had an exclusive interview with Justin Beckner of Ultimate Guitar and revealed the most challenging guitar part he worked on his life.

Here is his statement:

“I remember being very insulted by a guitar interview I did way back then, I don’t remember who it was with.

But, Rage Against the Machine came out during a time where there were no guitar heroes, it was all Nirvana strum-along – which were great music – but this guy asked me if I had slowed down the tape, played the solo and then sped it up to make it sound like that.

“I was, like, ‘You son of a bitch, I practiced 20,000 hours to be able to play like that! I’ll slow your tape down, you jackass!'”

You can listen to the part he’s mentioning “03.15” below:

Click here for the song.