This is a book only Questlove could have written: a perceptive and personal reflection on the first half-century of hip-hop. When hip-hop first emerged in the 1970s, it wasn't expected to become the cultural force it is today. But for a young Black kid growing up in a musical family in Philadelphia, it was everything. He stayed up late to hear the newest songs on the radio. He saved his money to buy vinyl as soon as it landed. He even started to make his own songs. That kid was Questlove.