The Irving M. Klein International String Competition will be in full swing this weekend at San Francisco State University, with semifinal and final rounds on Saturday and Sunday.

Known as a leading competition for young artists, the event for 23 years has showcased classical music virtuosos between ages 15 and 23, often helping them launch successful professional careers.

Some 74 cellists, violinists, bassists and violists from around the world entered this year’s contest; winners receive cash prizes and solo appearances with the Peninsula and Santa Cruz symphonies, as well as recitals in San Miguel de Allende, Mexico and the Tulsa Chamber Music Series in Oklahoma.

The semifinals run from 10 a.m. to 4 p.m. Saturday; the final round begins at 4 p.m. Sunday, with an award ceremony following at 7 p.m. The music happens in McKenna Theatre at San Francisco State University, 1600 Holloway Ave. Tickets are $10 to $25 general; $5 to $15 for students and seniors. Call (415) 282-7160 or visit www.kleincompetition.org.