Sentence:  "Buck"&#91;"ingham"&#93;   The Mayor is here at hand; pretend ſome fear, // Be not you ſpoke with, but by mighty ſuit; // And look you get a prayer-book in your hand, // And ſtand between two churchmen, good my lord, // For on that <WSD>ground</WSD> I'll build a holy deſcant: // And be not eaſily won to our requeſts: // Play the maid's part, ſtill anſwer nay, and take it. 
Meaning of the word marked with <WSD> tags:  The tune on which descants are raised; the plain song.