This segment shows Bebe and Debbie breaking it down towards the end of 'Lost Without You', and they've got the 'call & respond' thing down! The performance has obviously been rehearsed so it comes across as really polished yet so natural and effortless.

The video clip is taken from the DVD "Bebe Winans - Live and Up Close".
The original song can be found on the Bebe & Cece 1988 album "Heaven". (less info)