No commercial tracks clip, because they've all been sent to mastering, and they have a digital limiter on the Stereo-bus, which sets a "bolted" roof for the sound at typically -0.15dB.
But if you're talking about ear-fatiguing, unpleasant sound, it's just because they overehmphasized the higher frequencies (typically between 5-6khz - 20khz). If this is done digitally, it can become quite nasty.