Looking for some frivolous entertainment? Stay the hell away from the Schnitz tonight and Monday. In their final classical concert of the season, the Oregon Symphony boldly features just a single work on the program: Gustav Mahler's brilliantly constructed Symphony No. 3. Over the course of one-and-a-half hours, this massive composition will explore every corner of the human heart and mind, harnessing the power of 103 kickass musicians, a women's chorus, a choir of kids, and one internationally renowned mezzo-soprano, who's flying into Portland just to sing an existential poem by Nietzsche in the fourth movement. When it comes to music written for orchestra, Mahler's output is like no other, and the chance to witness such an event live should not be dismissed lightly. If a night dedicated to exploring unplugged sonic bliss sounds like a good time, get yourself a lower balcony ticket and maybe a sativa-dominant strain. BRIAN HORAY