COUNTYA teenage rock band This is the World will perform from 6 to 8 p.m. Saturday at the South Butler Community Library, 240 W. Main St. Members of the band are Austin Zarnick, Jesse Ort and Jason Brahler, who all attend Knoch High School. The opening act is a band also made up of Knoch High School students called The Underground Attics. Tickets are $3. Guests who buy advance tickets will get a free CD of music by This is the World. Tickets are available at South Butler Community Library. Call 724-712-9204.