On Saturday, April 15, 2006 at 8:00 pm, David Auerbach the Improvisator, performer of ancient instruments in awesome acoustics of caves and sacred spaces, will commemorate the 1906 San Francisco Earthquake centennial with a concert of ancient drums entitled "Drums of Earth: Earth-Shake in Spring" at an historic quake survivor landmark, the 1889 First Unitarian Universalist Church, 1187 Franklin St. (corner of Geary), San Francisco. Tickets for the concert are $30 general admission and $20 for seniors and students over 10, and information is available at http://www.cavemusic.net or by phoning (707) 224-4222.