"Usually, when Nirvana made music, there wasn't a lot of conversation. We wanted everything to be surreal. We didn't want to have some contrived composition. A song like "Heart-Shaped Box" – we would start jamming. Kurt would play the riff, and Krist would tune into what he was doing, and I would play along with the two of them. We would get into this dynamic, getting loud, then quiet, then loud. A lot of that quiet-loud thing came from those experimental jams."