Brian Slawson wrote Opa! as a celebration of Grandparents' Day - a holiday that honors the bonds between grandparents and grandchildren. The title holds two meanings: Firstly, "opa!" is a Greek expression often cheered at weddings and Greek dances. The word also translates to "grandpa" in German, a fitting coincidence for the meaning behind the piece!

Musically, the work takes inspiration from multiple sources. The slow, call-and-response introduction is loosely inspired by the counterpoint of Bach. Soon after, the tempo picks up as the full ensemble breaks into exuberant music-making, including several zany quotes from Pachelbel's Canon in D. This piece is a great addition to the intermediate ensemble repertoire for any festive occasion!