SNL 50' put on a concert for the ages Friday night in NYC ... as several superstar musicians and former cast joined forces to celebrate 'Saturday Night Live's half-century milestone!

Robert Redford was put between a rock and a hard place when torn between two classics, but only one got to be called his finest hour.

Courtney Patton's divorce from fellow singer Jason Eady shapes the Texas songwriter's new album 'Carry You With Me.' ...