The opener of Ænima and the song that set Tool's mature guitar sound: a 1979 Gibson Les Paul Custom Silverburst in Drop D into Adam Jones' twin-amp wall — a Diezel VH4 supplying the bottom and gain, a modified Marshall Super Bass adding the upper-mid grind and clean-up — through Mesa 4x12s. The intro and clean verses breathe through a Boss BF-2 flanger swirl before the chorus drops into a thick, mid-focused crush. Jones uses almost no gain stacking; the weight comes from the Drop-D Les Paul, the amp blend, and his slow, deliberate picking.