In the rock and roll world, David Crosby was a pioneer and a pioneer has passed away.

As multiple news agencies reported on Thursday, David Crosby, 81, the boisterous rock musician who went from a baby-faced harmony singer with the Byrd’s to a moustachioed hippie celebrity and an enduring troubadour in Crosby, Stills, Nash & (sometimes) Young, has passed away. According to a text message from Crosby's sister-in-law, the musician passed away on Wednesday night, as reported by The New York Times. The Associated Pres....