Emma Rolf plays German composer Felix Mendelssohn’s Symphony No. 4 Thursday afternoon as her instructor, Alice Joy Lewis, Ottawa Suzuki Strings director, looks on with a smile at the Carnegie Cultural Center, 501 S. Main St., Ottawa. Rolf, 15, Paola, said she’s been playing violin for 11 years, part of that time spent studying under the instruction of Lewis, who has directed Ottawa Suzuki Strings since 1966.