Here's a video from an Eric B & Rakim performance in Montreal. Can't figure out what club it's at.
Credit goes to The Meaning of Dope for the video.
Apparently he was always rapping over vocal tracks. When I saw him last June in NYC, he definitely dropped that aspect, thankfully.
epilogue; Looking at the ceiling during the video made me think that it may have been at another spot, Chang informed me tonight that as a youth he was present at the show, it went down at James Lyng high school, I was there a year before attending a Public Enemy show.