Oliver Wang

Early synthesizers were supposed to imitate or re-create other existing sounds, but as anyone can tell you, they mostly sounded like synthesizers. That distinctive whine and wheeze captivated all manner of pop artists, from prog-rockers to classical composers to soul musicians. However, back then, synthesizers were so expensive and bulky, you needed a major-label budget and an entire studio wall to install them.

Few 20th century thinkers predicted the 21st century era of social media and the Internet better than Marshall McLuhan. Beginning in the 1960s, the Toronto-based philosopher and scholar began to theorize about how television and radio were changing society, creating what he termed the "global village."

Before the rise of Def Jam as hip-hop's definitive record label, there was Profile, which helped shepherd in some of the genre's early shifts in sound and style. A new two-CD anthology, Giant Single: The Profile Records Rap Anthology, chronicles the label's 15-year history and legacy.