Tallis' ethereally beautiful Miserere is relatively rarely heard which is a great pity as it's a remarkable piece of music that shows Tallis' mastery of complex counterpoint. It's written for seven voices and contains not one but two canons the first of these – the one between the two top voices is pretty obvious but the second is both far more elaborate canon and less obvious. It's between four voices with the discantus being sung by the contratenor in double augmentation (double augmentation is the where the notes are four times as long), the first bassus part is sung in triple augmentation (in other words the notes are eight times as long) and bassus ii in simple or plain augmentation (the notes are twice as long). The result is an amazing amount of musical beauty packed into just over two and a half minutes . You'll find it, its text, and a translation to English below. Enjoy :-).