Randy Rhoads' tone on Crazy Train combines classical precision with heavy metal aggression. His Les Paul Custom through a cranked Marshall with an MXR Distortion+ produces a tight, articulate distortion with singing sustain. The iconic opening riff requires precise note separation and a tone with enough gain for sustain but enough clarity for the rapid alternate picking passages. Rhoads' classical training meant every note was deliberate, and his tone reflected that precision.