It's been a beautifully melodic friendship. Ex-Band guitarist and all-around roots virtuosos Jim Weider and his terrific ProJECT PERCoLAToR band now make regular stops to perform at The Stage in The Olde Mistick Village Art Cinemas. On their last appearance there, Weider and company celebrated an in-concert album with another local connection, "Live at the Mystic Blues Festival 2013." Who knows what they'll have in store Saturday night when Weider and ProJECT PERCoLAToR return to the Art Cinemas for another show. But count on sonic excellence ranging from blues to rock and country. Showtime's 8:30 p.m, 27 Coogan Blvd., Mystic; $25; (860) 536-0024.