Phil Kline's preferred "flat" vocal affect may be off-putting to folks unfamiliar with it, but if this is new to you, just download any of the "ordinary" parts of this mass and listen to the stunning skill in the singing. Once that sinks in, start listening for the creative blending of harmonics and then styles. Finally, listen for the wonderful, unique spirituality that suffuses this great piece, especially in the contexts Kline creates. Others write intelligently elsewhere of Kline's musical influences, but no one can deny the unique beauty of his compositions. A great work.