If I take Reich's link a few posts before, I can hear typical Reich : contemporan architecture with very classical harmony, right ?
Reich is easy listening to me, like Django is in what we strangely call "jazz" (obvious because of improvisation in it, but far from the other main styles).
Because 90% gipsy guitar is common harmonies and cadences (word in english ?), it could be sold next to pop music in our fnacs. See Sanseverino...
Contemporan music may be very close to classical composition to me, even though there's no melodic instrument in the piece of music. But jazz consantly try to break the rules, no ? (contemporan guys do the same, dammit)
But rules (and limits) are something we have if we close our mind to other uncommon rules. Like Kermit, I have trouble with some kinds of music, but that's not especially jazz, I'd rather say music that never follow a common rule we can find in mainstream music.
When I have trouble with that kind of music (Miles Davis is an example), I try to listen it as an experience, not like a commonly built piece of music. If I try, I won't get the point and appreciate the shit.
It's the same with contemporan, if I don't understand it, I try to listen it as if it wasn't music, but a listenable phenomen... Sorry I'm OT !
And actually I find common points instead of differences... Muhaha. But I wasn't the first to talk about boring shit, that IS off-topic.