What is "descants"

Usage examples of "descants".

Would the sun shine for us more bravely, or the flowers give forth a sweeter breath, or yonder warbling vireo, hidden in her leafy choir, send down more pure and musical descants, sweetly attuned by natural magic to woo and win our thoughts from vanity and hot desires into a harmony with the tranquil thoughts of God?

Greeks, which their oldest writers do not pretend to have invented, was no more than a light air, which had passed from a more ancient people into the flutes of the Greeks, which they modulated to such descants as best suited their fancies.