Charles Barkley -- Turrible Karaoke Session ... SAVED By Boyz II Men

So there he was ... Charles Barkley MURDERING a karaoke rendition of "End of the Road" at a bar in North Carolina ... when suddenly the guys from Boyz II Men appeared on stage and saved his ass.

It all went down at a bar in Raleigh -- Charles and B2M were in town for the Jimmy V Celebrity Golf Classic to raise money for cancer research.

After Charles hit the links, he grabbed the mic during a karaoke event ... and proved once and for all that his voice is EVEN WORSE than his golf swing.

But just when the crowd at Lucky B's couldn't take any more ... Boyz II Men emerged from the crowd, and blew everyone away.