Accordionist Horace Trahan leads the Zydeco Capital Jam from 1 to 3 p.m. Sept. 13 at the St. Landry Parish Visitor Center, I-49 exit 23, in Opelousas. A songwriter and singer with diverse accordion skills, Trahan plays zydeco, Cajun, blues, country and more. Trahan is the featured performer on “Steppin’ Out with Horace,” a new EP from Diamond J and the Ruby Red Raindrops. The release adds to Tra…