I don't think I do. I'm told I'm sometimes a little sharp, but close to the actual note. If I can't hear myself, forget it. I also cannot pick apart the notes in a single chord.
However, I found I can harmonize okay. We had my youngest sister, who we think may have AS because she is just like me, and my best friend who is a diagnosed aspie over and played Beatles Rock Band. We started singing along and at the end of "Ticket to Ride," I think, my best friend said, "Meet the all female Crosby, Stills and Nash," because evidently we all sang in proper three part harmony without realizing it.