Final answer:
The Pope Marcellus Mass requires six voice parts, highlighting Giovanni Pierluigi da Palestrina's polyphonic choral mastery in Renaissance music.
Step-by-step explanation:
The Pope Marcellus Mass requires six voice parts to sing. This masterwork by Giovanni Pierluigi da Palestrina is one of the most famous examples of Renaissance polyphonic choral music. Its rich texture is created through the interweaving of these six separate vocal lines, typically including soprano, alto, tenor, and bass, with some parts divided to create the six voices.