Oklahoma Strings opened in 1987, and is dedicated to providing the Greater Oklahoma area with superior sales, service, and rental. Oklahoma Strings also offers an award winning quartet for hire that is available for weddings, parties, and other special occasions. Oklahoma Strings is a locally owned and operated by Joe and Anne Guevara.. Sales,Repairs and Rentals or Orchestral Stringed Instruments. Oklahoma Strings Quartet available for weddings and entertainment music.