Ex Cathedra (/ˌɛks kəˈθeɪdrə/ EKS-kə-THAY-drə) is a leading British choir and early music ensemble based in Birmingham in the West Midlands, England. It performs choral music spanning the 15th to 21st centuries, and regularly commissions new works. Ex Cathedra have collaborated with Fretwork (music group), the City Musick, His Majestys Sagbutts & Cornetts, Concerto Palatino, Birmingham Opera Company, Sinfonia New York, Birmingham Royal Ballet, the City of Birmingham Symphony Orchestra, Quebecois dance company Cas Public, the Shakespeare Institute, and the Shakespeare Birthplace Trust.