A musical ritual used to celebrate daily or extraordinary events in the community life of a math or concent. The music is performed a capella, using only the human voice and body-slapping. The community is called to the aut by a bell-ringing sequence. The most prominant aut is Provener, which celebrates the daily winding of the great clock, just before the mid-day meal. It includes a lesson on past theoric accomplishments. Other auts celebrate milestones in an avout's life, such as Eliger and Voco, or periodic events such as Apert.