Ms. Rabas began playing honky-tonk piano on the knees of her grandmother at Methodist church revivals. In serious study at the age of three, she began accompaniment study at ten for her mother, an opera singer. Living in Billings since 1978, Sandi has been church organist and coordinator of music ministries since 1979. As staff pianist for Rimrock opera, she has played for The Barber of Seville, Madama Butterfly, The Merry Widow, Carmen, Tosca, La Traviata, Die Fledermaus, Così fan tutte and The Girl of the Golden West. Her opera duties range from playing in the pit augmenting the sound of different instruments on an electric keyboard, to cuing supertitles from the balcony. She plays outreach opera tours, including Madama Butterfly, The Telephon; Gourmet Dinners, Laurel Ford Christmas, RO’s general auditions, From Met to Broadway and The Night Harry Stopped Smoking school tour. Ms. Rabas made her Opera Idaho debut playing concerts and the production of Madama Butterfly. She has accompanied Rimrock Opera Chorus for Kids (ROCK). Ms. Rabas was the accompanist for Rimrock opera's One Act Festival in 2005, playing all four one-act operas each evening: Sister Angelica, Impresario, The Hand of Bridge and The Old Maid and the Thief. She maintains a private piano and accompaniment studio. 

Amongst her opera duties, Ms. Rabas plays in the orchestra, augmenting the sound of different instruments on an electric keyboard, or she can be seen in the balcony at the Alberta Bair Theater, or running the Supertitle machine. Sandi has also played outreach opera's in the community, including Madama Butterfly, The Telephone, Gourmet Dinners, Laurel Ford Christmas, RO’s general auditions, Met to Broadway and The Night Harry Stopped Smoking school tour. Ms. Rabas made her Opera Idaho debut, playing concerts and the production of Madama Butterfly.