Filmmaker Penny Lane brings her inimitably quirky outlook to the art and business of children’s music, an industry generally skipped over by those above the age of 10. Way beyond the grating basicness of “Baby Shark,” Lane profiles performers invested in creating the tastes of kids—artists wanting to shape what children will understand to care about. Among the standouts is former grunge rocker Chris Ballew, who notes amusingly that kids are like the “greatest drunk people ever” for their wild abandon at his concerts.