All skill levels are invited to sing American shape-note hymns, fuging tunes and anthems in unaccompanied four-part harmony from 10 a.m. to 3:30 p.m., Saturday, March 3; and from 9:30 a.m. to 2:30 p.m., Sunday, March 4; freewill donation. Visit tucsonfasola.org for more information.