I just happened on this thread during a break from work. Earlier, I had been listening to what might be called modern classical music, staring with Gorecki's Third Symphony (London Sinfonietta). Also on the CDP was Tavener's The Protecting Veil; Arvo Part's Fratres, (Tabula Rasa, Spiegal im Spiegal,ect); Peteris Vasks' Distant Light; and Christo Hatis' Awakening. IMHO, all of these modern classical works are exceeding beautiful, emotional, and reflect the spiritual side of the human condition. They all are tonally complex and have patterns that are unique to modern music. However, I would not be able to "hum" a tune from any of the works mentioned. What I find important is that each piece involves some experimentation with tone and structure.
Other modern music, Schoenberg for example, is intellectually stimulating, but more emotionally upsetting, especially his later works. I can't work or socialize with this type of music in the background. IMHO, atonal modern music, in particular, creates an emotional dissonance in the listener that is often not very pleasant and can be anxiety producing, unlike some of the older works (e.g., Bach, Mozart) or the modern music mentioned in the above paragraph. This might be another explanation for the delay in applause. That is, atonal modern music does not make you feel good, rather it can have the opposite effect. This is understandable, as the impetus for some post-modern music is to express the alienation of modern humans. In this case, applause of an audience has to be forced rather than spontaneous.
Other modern music, Schoenberg for example, is intellectually stimulating, but more emotionally upsetting, especially his later works. I can't work or socialize with this type of music in the background. IMHO, atonal modern music, in particular, creates an emotional dissonance in the listener that is often not very pleasant and can be anxiety producing, unlike some of the older works (e.g., Bach, Mozart) or the modern music mentioned in the above paragraph. This might be another explanation for the delay in applause. That is, atonal modern music does not make you feel good, rather it can have the opposite effect. This is understandable, as the impetus for some post-modern music is to express the alienation of modern humans. In this case, applause of an audience has to be forced rather than spontaneous.