Actually, Might A's more correct than you realize. The Classical composers of yesteryear were the "Pop songwriters" of their time (the equivalent of today's Pop songwriters i.e. Maurice Starr, Max Martin, Eric Foster White, etc.), writing music that would have to pass muster with the ruling King, Emperor or the Church officials who were often the ones to commission the work in the first place. The aritsts did write their own pieces for their own enjoyment, but they usually found more commercial success when paid by the nation's hierarchy.
And, remember, just because it's not Classical or Metal doesn't mean that it's not a valid form of music.
Quite a unique trick considering Tool was already signed and released their first EP at least 3 years before Korn even got out of the box. I wouldn't call them rambly or incoherent. Their songs are quite well structured, unlike Korn, who essentially utilize their instruments to create weird noises and some chord progressions to base their tunes on. Tool is also one of the few bands to actually use odd time signatures on a regular basis without making the material sound choppy.