“SNL50: The Homecoming Concert” will bring together some of the biggest names in music past and present, most of whom are notable “SNL” musical guests. Cher, Dave Grohl, Jack White, Lady Gaga, and Snoop Dogg are among tonight’s performers.

Live has delivered a regular dose of New York City to millions of TV viewers for a half-century. Now, the city – or at least Midtown Manhattan – is getting a heavy dose of SNL. Downstairs from the NBC staple’s home at 30 Rock’s Studio 8-H,