Music's top stars hit the red carpet Sunday for the Grammys, with veteran rapper Jay-Z up against younger hopefuls, including French electro duo Daft Punk and New Zealand songstress Lorde. Older acts were also up for honors at music's version of the Oscars, among them Led Zeppelin, the Rolling Stones, Black Sabbath and the Beatles, whose surviving members were due to perform. LA rapper Kendrick Lamar, pop diva Taylor Swift, chart-topper Justin Timberlake and Seattle hip hop duo Macklemore & Ryan Lewis are also among those vying for prizes at the 56th annual Grammy Awards in Los Angeles.