First, Hecklaphone is categorically wrong. Second, Nirvana, your response doesn't seem to address why it's wrong, at least not to my satisfaction. Maybe you're going too easy on Heckla :P
Forget what we know about "prescriptive" structures in these various languages and styles of music. None of these formulaic systems of compositional style are "concrete," per se. "Common-practice tonality" DOES NOT base itself on ONE NOTE. Traditional western music centralizes and manipulates a diatonic sonority, usually either the Major or Minor tonalities of the style. A 'C' isn't the gravitational factor, it's the combination of C, E, and G or A, C, and E, for example, that are the focal points of the style, and these are only "gravitational" due to the relationship of the dominant/dissonant sonority to the tonic/consonant sonority. In short, we wouldn't say a piece is written in the "tone of C", we'd say the piece was written in the "key of C", the "key of C Major/Minor," etc. because we're referring to a sonority, whether applicable in an ensemble work or harmonically implicit in solo works.
That music is formulaic doesn't legitimate it. I could make up any set of guidelines for organizing pitches, rhythms, sonorities, etc, claim it's a language of music, and no one will have any way to say, "No, it's not." Traditional western music doesn't even require that we follow every single one of its "form, rules," etc, which is one reason why we learn about "exceptional" composers of the tradition like Bach, Beethoven, etc who more or less made their own rules rather than blindly following in others' footsteps - one good example is Wagner's Liebstod from Tristan where the climactic harmonic progression is actually a "regression" from a V to a IV - not exactly a "common practice" of traditional western music, but who honestly thinks in makes a difference at this point whether it makes the Liebstod "tonal" or "atonal" because of some "rule"? In this way, Nirvana, I think you're misunderstanding what is "legitimate" about contemporary music...
Just like these composers of traditional music just happened to refine their approach to music in an "aesthetically convincing way", so to speak, that's exactly what we do in contemporary music where no harmonic hierarchies or "rules" apply. We're losing sight of this in the discussion of tonal/atonal music. It's not an issue of whether rules are followed, whether one is more complex than the other. The greatest thing we can take away from the emergent contemporary styles of the 20th Century in western music is the understanding that these "rules" aren't rules at all... we don't need to follow them to create convincing music. We only need to appreciate why these theoretical principles exist, why they are relevant to us (if at all), and whether our music benefits from the application of these principles.
Thus ends another rant. -AA