Join California Academy of Sciences for an evening with Bernie Krause. An outspoken musician and environmentalist, he has been recording nature's vibrant chorus -- hippo grunts, birdsong and even a tree's bursting cells -- for decades. Author of The Great Animal Orchestra: Finding the Origins of Music in the World's Wild Places, he says 'a complex and vital beauty emerges hearing the sounds in context with each other.' In the 1960s, Krause replaced Pete Seeger as guitarist for the legendary folk group The Weavers. The event is being held at the Jewish Community Center of San Francisco.