A rehearsal for the 2021 Spasskaya Tower International Military Music Festival took place in Moscow's Red Square, with St. Basil's Cathedral in the background, on August 26. /CFP

Fireworks explode as a combined military band of the participating countries performs during the rehearsal. /CFP

The music festival is an annual military music event held in Moscow's Red Square, with the motto "To Revive Traditions and Preserve History." /CFP

This year's festival will be held from August 27 to September 5. /CFP