The term KEY LOCALE can be defined by two crossword solutions: RAMPARTS (8 letters) and PIANO (5 letters). RAMPARTS are fortifications, typically made of stone or brick, that surround a city or other settlement. They were used in the past to protect the inhabitants from attack. PIANO is a musical instrument consisting of a keyboard with hammers that strike strings to produce sound. It is one of the most popular instruments in the world and has been used in many genres of music. Together, these two words describe a place where music is played and protected.