We know very little about Sheppard's life (and much of what we 'knew' turns out to be wrong) but his contemporaries and later generations of musicians fully recognised his importance more than 40 years after his death Thomas Morley praised his music. His Latin works mostly date from the reigns of Henry VII and Mary I with Gaude, gaude, gaude Maria most likely dating from sometime in Mary's reign. It's a setting of the Respond and Prose at Second Vespers at Candlemas and it takes the chant as its cantus firmus. It's very densely written with some gloriously elaborate counterpoint weaving its sinuous way around the cantus firmus. Enjoy :-).