This weekend, there are opportunities to catch a cornucopia of rock and roll, folk, blues and more. Thursday, Dec. 6 Mountebank (ATX), Moonsong at Stage 18 (Fayetteville) - $5, doors at 8 p.m. Achi at Harry's Downtown (Fort Smith) - $5, 9 p.m. Friday, Dec. 7 Route 358 at Black Apple Crossing (Springdale) - 8 to 10 p.m. Honeyjack at Meteor Guitar Gallery (Bentonville) - $10 adv, $15 day of, 8 p.m. Melody Pond at The Artist Retreat Center (Bella Vista) - $10, 7 to 9 p.m. Baub Eis Band at Chelsea's