Justin Timberlake & Jay Z — This One’s for Trayvon Martin

Justin Timberlake and Jay Z honored Trayvon Martin Friday night … dedicating the song “Forever Young” to the 17-year-old shooting victim.

Jay and Justin kicked off their “Legends of the Summer” tour this week — and during their closing number Yankee Stadium in NYC -Jay shouted to the audience, “Everybody put a cell phone and light it up … let”s light the sky for Trayvon Martin tonight in here.”

Beyonce also dedicated a song to Trayvon … shortly after George Zimmerman“s not guilty verdict last weekend.