Weezer
Buddy Holly
A driven Gibson P90 straight into a Mesa/Boogie Mark I — power-pop crunch with almost no effects. It's the Mark I, not the Marshall JCM800 most people assume.
Pantera
Cowboys from Hell
A Dean 'From Hell' ML into a Randall RG100ES solid-state head — the fizzy top end is the point, not a tube amp. An MXR 6-band EQ shapes it.
Rage Against the Machine
Killing in the Name
A Fender Telecaster into a 50-watt Marshall JCM800 2205 — and a DigiTech Whammy set to +2 octaves that makes the solo.
Nirvana
Come as You Are
The watery verse tone is an Electro-Harmonix Small Clone chorus, into a Mesa/Boogie Studio preamp — with a Boss DS-1 for the fuzzed choruses.