"That was a very moving and poignant experience. We didn’t say much about it beforehand, and we didn’t say much about it afterward, because we thought the music said enough. I wanted to do ‘Boot Camp’, because that was my favorite song on [Soundgarden’s 1996 album] ‘Down On The Upside’, so I went and learned it, but the thing with Chris is, he would tune the guitar to his voice, so it’s kinda complicated to learn from following YouTube!"