Oakland siblings Rachel, Erika, and Chloe, otherwise known as the band the T Sisters, are experts at Americana harmonies. Their musical talent even has been noticed by the likes of the Indigo Girls and Amos Lee, both of whom the sisters have musically supported. And now they will be bringing their act to the Sonoma County Farm Trails’ Gravenstein Apple Fair benefit concert. Joining them will be the Beau Beau Trio, playing roots and R&B; the Whiskey Family Band, churning out high-energy bluegrass and rock; and Burnside, playing funk/rock dance tunes. Besides the live music, there will also be food available from local eateries, such as Fork, Handline, and Mom’s Apple Pie. Concerts will be held on August 14, 11 a.m.–5 p.m., at Ragle Ranch Park in Sebastopol. Admission is $75 with a limited number of $60 tickets available only to Sebastopol residents. Purchase tickets at farmtrails.org/tickets.