  The Bayreuth Festspielhaus is well known for its architecture because its
design is heavily influenced by composer Richard Wagner. Due to the special
acoustic design, the reverberation time (i.e., time scale for the sound
pressure level to decay $60$~dB) is larger than usual opera houses. Using
hand-claps and smart phone recordings, I measured the impulse response of the
Bayreuth Festspielhaus in the auditorium, on the stage, as well as in the
orchestra pit. The measured reverberation time shows quantitative agreement
with the literature values within a certain frequency range, demonstrating the
possibility of using this approach to monitor room acoustics.
