Pentatonix! They have great arrangements.

 

Kyrie from the Missa pro Editione Tertia by Christopher Mueller

 

Look at that Bass! It is fun to see how a great song can have different interpretations.

 

Holy, Holy, Holy from the Missa pro Editione Tertia by Christopher Mueller

 

Agnus Dei from the Missa pro Editione Tertia by Christopher Mueller