OctoPladd’s music is melodious and heartfelt while also funky and occasionally goofy, not unlike their name (a complicated story they’d have to tell you in person). United by their roots in bluegrass, they draw on myriad influences to produce Appalachian melodies tempered with chromaticism and groove. The quartet combines the sweeping lines of Julian Pinelli’s violin with the snap and groove of mandolinist Ethan Setiawan. Sam Leslie adds imitable guitar, all supported by Noah Harrington on bass. These four talented musicians met in Boston’s thriving roots music scene. The quartet’s hope is to create music with an electric edge to its acousticality.