It's time to put on your thinking caps. Â When a soloist strides on stage to play a concerto, they are the center of attention, but how many times has the Concertmaster delivered a solo, or multiple solos, in a piece of music without ever taking center stage? Now's your chance to test your ear. Â How many famous solos can YOU name? Â The video above will give you a hint for one of the answers. Jonathan Carney, Concertmaster of the Baltimore Symphony, has compiled a little quiz. Â You can take it here.