Letitia (Tish) Berlin and Frances Blaker perform and teach at recorder workshops throughout the U.S., and they have both served on the board of the American Recorder Society. They play in the recorder duo Tibia and are also members of the Farallon Recorder Quartet, Calextone, Bertamo Trio, and Ensemble Vermillian. Frances is the author of Opening Measures: a Compendium of Practice Techniques, which includes articles she has published in the ARS magazine over the last 20 years. Tish is the director of the Hidden Valley Early Music Road Scholar program and has performed with the Carmel Bach Festival and the Atlanta Baroque Orchestra as well as other ensembles. Frances is Festival Director of the Amherst Early Music Summer Festival. Tish teaches at and is on the staff of the AEM Festival. Together they administer the AEM online classes.