Some kids might admit to their parents that they want to play a musical instrument. Some might even want to make it their lives. Tai Murray was like that at the age of 2 — but she also had an uncanny sense others lack. “At a very young age, I knew it would entail a lot of work,” Murray says. “All that stuff — practice, hard work. I just knew it. I was serious and I kept badgering my mom for the next three years until she said OK and I got the crackerjack box with a ruler and never looked back.” The self-aware toddler has grown into an assured and accomplished violinist, earning critical acclaim for her technique, her virtuosity and her “depth of tone, mature sound and steely sweetness.” She performs Samuel Barber’s Violin Concerto with the Cincinnati Symphony Orchestra 11 a.m. Friday and 8 p.m. Saturday at Music Hall.