Usher Sings Jackson 5 in Karaoke Bar!! [VIDEO]

Where there is love, Usher will BE THERE — or so he promised earlier this week at an L.A. bar …  during a pretty incredible karaoke rendition of the Jackson 5′s “I’ll Be There” … and it was all caught on tape.

The song requires some pretty impressive falsetto — but Usher hit ALL the notes early Tuesday morning at Rock & Reilly’s on the Sunset Strip … and the crowd loved every second of it, singing along the whole time.

Sources tell TMZ, Usher had been hanging out upstairs in a private area with friends throughout the night — but came down around 1am to show the bar how karaoke is REALLY done.

(It’s a pretty ironic song choice — considering Usher was NOT there …at his stepsons funeral two weeks ago … though the singer never explained why.)