A huge part of being a rock rebel is the willingness to defy audience expectations, even when such moves threaten your career. David Bowie has spent the last 45 years doing that. He killed off his Ziggy Stardust character at the height of his glam fame. He released a Philly soul LP when most of his followers were diehard rock fans. He made weird, noncommercial music in Berlin, and then toured as Iggy Pop's keyboardist in clubs when he could have been packing arenas on his own. But his most recent move was his most rebellious: a decade of silence and seclusion, followed by a surprise album he refused to promote with a single interview or live performance. The move meant that his album The Next Day went tumbling down the charts not long after it came out, but it's hard to imagine that Bowie cared that much.