Friday and Saturday. The Musica Sacra Chamber Orchestra, a fixture on the local scene, has changed it name to the Stratus Chamber Orchestra. The new moniker better reflects the ensemble’s programming, which is a mix of sacred and secular. Stratus kicks off its 2015-16 season with “Anniversaries: 150th Birthday of Sibelius,” celebrating the best thing ever to come out of Finland. John Sibelius is pictured above. The concerts start with Stravinsky’s “Pulcinella” and Aaron Copland’s “Outdoor Overture,” before moving to Sibelius’ Symphony No. 3. The Valor Symphonics Youth Orchestra will sit in with the pros. 7:30 p.m. Friday, Valor Christian High School, 3775 Grace Blvd., Highlands Ranch, and 7: 30 p.m. Saturday, Augustana Lutheran Church, 5000 E. Alameda Ave. Denver, $10-$25. 303-388-4962 or .
