Also heard the Vaughan Williams Mass today. Made me think about the opposite of juxtaposition which is the seemless flow of music of Palestrina, etc (and to some extent Bach) - and Vaughan Williams. It strikes me that this music has everything to do with 'voice'. We hear the voices of the parts, whose movements appear to us individually coherent (how - is there a vicarious element to this??). When the voice is broken (with new textures, harmonies.. or juxtapositions), there is a different level of engagement (what is this?) - the vicarious experience of motifs and ideas?