The PBS series “From the Top at Carnegie Hall” is the television offshoot of pianist Christopher O’Riley’s “From the Top” NPR program. Young musicians showcase their serious skills in a light-hearted format. The second season is underway and they’ve put even more emphasis on the peeks behind-the-scenes, interlacing practice sessions and scenes from homelife into the actual performances, something that may horrify straightlaced classical music aficionados. It works well for the hoped for target audience of the next generation of musicians, who are being raised on fast-cut videos and reality television. The episodes are online and the results of these hard-working kids are mesmerizing, plus they’ve certainly been selected for personality as well.