I'd be remiss if I didn't mention that one or two people at the same time dancing down an aisle formed by two other rows of people facing each other was popularized by the 1970s, 1980s R&B dance show "Soul Train". That dance format became the signature of the show, and was so popular that even to this day people still speak of dancing down the aisle made up of two rows of people as doing a "Soul Train line".

Here's a comment I found online about that TV show:

"Soul Train started as a local Chicago teen dance show in the late 1960's. The local show was still running for a few years even after Don Cornelius mounted the national syndicated version in California. I remember that everyone would stop what they were doing when this show came on. The show totally rocked in the 1970's and 1980's. We all learned the latest dances from watching the Soul Train line, near the end of the telecast"...
http://us.imdb.com/title/tt0161194/

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Also, here's a YouTube video of a Soul Train line from that tv show:

http://www.youtube.com/watch?v=ox0IzWR4LX8

Eve - Tambourine (Soul Train Line)
"Old 1970's Soul Train Line dancing to Tambourine"

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[This is an early rap song, "Eve" is the vocalist]

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With regard to the show's name "Soul Train", the motif of the show was a drawing of an old fashioned "choo choo train" with smoke billowing out of it. In my opinion, not only did that train motif hark back to the downhome gospel train, but also reinforced the fact that the dancers were "hot" {another way of saying they were hot {good dancers} was that they were "smokin'"}. Of course, the word "soul" is still a familiar colloquial refer for Black {African Americans}.

We got soul!