Example of atonal music which avoids octaves, avoids major and minor triads, avoids more than three notes from the same diatonic scale, and avoids conjunct melodies/uses disjunct melodies. From Schoenberg's Klavierstucke, Op. 11, No. 1.
Excellent if lo-fi recording of three voices, two male and one female singing and building one note at a time a major chord triad, saying, "hello," thrice. I use it as a ring tone. Recorded with an ipod and griffin italk mic.