Ms. Koontz has performed leading roles with the Chicago Symphony Orchestra , San Diego Opera , Central City Opera , & Opera on the Avalon . Her repertoire includes the roles of Tosca in Tosca , Mimì in La Boheme , Leonora in Il Trovatore , Alice Ford in Falstaff , Donna Anna in Don Giovanni , & the Countess in Le Nozze di Figaro.

Equally comfortable on the concert stage, she has performed as a soloist with the San Diego Symphony , Chicago Symphony Orchestra, South Bend Symphony, California Chamber Orchestra, La Jolla Symphony & Chorus , Helena Symphony, Glacier Symphony Orchestra, Chicago Arts Orchestra , Newfoundland Orchestra , Coeur d’Alene Symphony Orchestra , Spokane Symphony Orchestra .