NEW YORK (AP) — Melanie Musson in Belgrade, Montana, does a lot of driving with her four girls. Juggling a broad age range, 1 to 9, she's forever searching for ways to keep them all entertained without relying entirely on video.

While she still adores paper and tablet books for her kids, Musson said: "I think when they hear without seeing, they have to make up visuals in their heads. That's so good. They have to be engaged and get more out of it."

There are plenty of quality audiobooks, podcasts and music for the young, she noted, but weeding through thousands of selections and jumping from pl...