katlaughing, to answer your question.

The Night Watch is a composition by Anthony Holborne (fl. 1584-d.1602), who referred to himself as "Gentleman and servant to her most excellent Majestie", Queen Elizabeth I. He was an expert lute maker, song writer, poet, and composer for the lute, cittern, bandora, viol and violin, and wind instruments - so top of his particular tree. You can hear The Night Wtach being played here.

The title refers (I assume) to the town or city waits, as the night watch on the city gate was one of their duties. The waits are described in this way on this site:

"From medieval times up to the beginning of the 19th century, every British town and city of any note had a band of Waits. Their duties varied from time to time and place to place, but included playing their instruments through the town at night, waking the townsfolk on dark winter mornings by playing under their windows, welcoming Royal visitors by playing at the town gates, and leading the Mayor's procession on civic occasions."

Lots of cities now have bands who play early music, call themselves waits, and dress in old waits' clothing when they play for the public. If you'd like to see or hear any of them, click here.

Cheers
Stower