Writes New Song for Kobe Bryant

Brian McKnight is honoring his late friend, Kobe Bryant, with a new song that's guaranteed to get you crying all over again over the passing of a Los Angeles legend. Be warned ...

The R&B crooner wrote a tune specifically dedicated to Kobe -- and by extension, to the basketball star's daughter, Gianna -- called "Can't Say Goodbye." We got a video of Brian playing it on guitar, and it's incredibly touching and sweet. Check it out for yourself ... but again, waterworks.

In the video, Brian says he wrote the song ... but can't really take credit, because it wrote itself. The lyrics touch on saying other versions of "goodbye" without actually uttering the words themselves because it's just too…