The Opera Dukes — baritone (and San Francisco Opera General Director) David Gockley; Adler Fellows Matthew O'Neill, Melody Moore, Jeremy Galyon and Gerald Thompson; SF Opera Orchestra members Craig Reiss and Jonathan Lancelle; and banjo player David Walker — take the stage at the sixth annual Hardly Strictly Bluegrass Festival at 11:10 am, on the Arrow Stage in Golden Gate Park's Speedway Meadow.

Their set will include countertenor Gerald Thompson performing a bluegrass rendition of "Di tanti palpiti" from Rossini's Tancredi, a Kentucky waltz version of "Una furtiva lagrima" from Donizetti's L'elisir d'amore with Matthew O'Neill on high lonesome tenor [sic], a special arrangement of "The trees on the mountains" from Carlisle Floyd's Susannah featuring Melody Moore, and traditional bluegrass tunes.

Festival admission is free; no tickets are required. For more information on the Hardly Strictly Bluegrass Festival, visit www.strictlybluegrass.com.