Bonn’s Klangwelle is a mix of spectacle and sound in which music, water, fire and light are synchronized in perfect harmony.

Opening Saturday and running through Oct. 3, shows take place evenings at the Münsterplatz at 8 p.m. Kicking off with classical music, the program gives way to rock, pop and guitar music, finishing with traditional German songs sure to have the crowd singing along until closing at about 10 p.m.

The Klangwelle is free. Its website is www.klangwelle-bonn.de (German only).