English Part-Song of the 16th-17th Centuries
Puzzle 18 of Architectural Styles Hard Pack
Question is: English Part-Song of the 16th-17th Centuries
and the answer is: MADRIGAL
Word Meaning:
MADRIGAL — (music) A song for a small number of unaccompanied voices; from 13th century Italy.
Definitions from Wiktionary.