Ringing Tone and Drumming Sages in the Crevice Cave of Pirunkirkko, Koli, Finland

Pirunkirkko (“Devil’s Church”) is one of the famous caves in Finland. Tradition says that this crevice leading into the mountain was a meeting place for sages, who typically used sound to contact the spirit world. Today, the place is visited by practitioners of shamanism, who organise drumming sessions at the back of the cave. This article examines Pirunkirkko and the related traditions from the perspective of acoustics, hypothesising that the acoustic characteristics of the crevice might have played a role in the ritualisation of the place and the power of its rituals. Methods employed include impulse response recording, spectrum analysis, archival research, and interview of a shamanic practitioner. The results indicate that the back of the cave houses a distinct resonance phenomenon. A standing wave between the parallel walls generates a ringing tone at 219–232 Hz that stays audible after sharp impulses or vocalisations at the same frequency. The local folklore or the interviewed practitioner does not mention this phenomenon at all. Instead, they speak about the “spirit of the cave,” “special energy,” or “new horizons” opened up by drumming. This leads to reflection on cultural frameworks of thought that guide sensory perceptions leading to differing experiences and interpretations.