Finally, after waited for one week, they posted their last week's worship service online in the WebCast:
https://www.brooklyntabernacle.org/media/webcast
Under Sunday February 25, 2018 (For the service of 2/18/2018)
The song I loved is in the time frame 21:50 - 28:20, titled "How Excellent" - is Your Name. It appears to be a black gospel favorite. Originating from, it would appear, an older hymn: O Lord, Our Lord, How Excellent.
Here's a lesser quality of the same from an earlier time:
Since when was a gospel choir such as Brooklyn Tabernacle Choir interested in counterpoint?