Pneumonia has forced David Sanborn to cancel his scheduled Britt Festivals appearance on Friday, but Craig Chaquico will perform instead.

Chaquico played lead guitar and wrote songs with the popular gold and platinum selling bands Jefferson Starship and Starship. He has developed a classic rock show that incorporates many of his hits from those bands and his solo career, as well as his interpretations of classic guitar rock covers.

Tower of Power will round out Friday’s show as originally scheduled.

Ticket holders can use their existing tickets to see Friday’s show with its new lineup, or get a refund, credit or exchange tickets for another show this season, Britt officials said. To receive a refund, exchange or credit, patrons must bring in or mail in their tickets before the concert. Tickets also can be donated back to Britt.

The Britt box office is at 216 W. Main St., Medford, and can be reached at 773-6077.