The Propter Hoc Chamber Choir is a choir of about 30 voices, comprised of singers from around Kitchener-Waterloo. The choir, as well as its precursors the Ad Hoc and Post Hoc chamber choirs, has been heard at porch parties throughout KW, and regularly raises money for local music-related charities at its own concerts. This year, the choir is performing a selection of folk songs from Canada, the British Isles, and beyond.