Conga lines are GREAT and if you're talented enough to get one going at a karaoke show, go for it!
Perhaps your singer sang "CUBAN PETE" because it was recently used as a dance routine on Dancing With The Stars. This happens frequently at my shows. If they used it on THAT show, it always translates into a performance at my show.
Personally I really like watching Dancing With The Stars- probably my favorite show, as i watch very little tv nowadays. I'd rather dance than sing, and i do love to sing!
The MANY (400+) corporate events over the years i've performed included "Hot Hot Hot" as the conga line song and the largest line being easily over 600 participants in an outside event for Verizon. This included hundreds of kids and went down the stretch of The Mall in Washington DC between the Capitol And The Washington Monument.
That's the Largest Conga Line i've done.
The Largest LINE DANCE was 1,100 dancers STRONG and was an Electric Slide at a T-Rowe Price corporate event in the summer of 2001. Needless to say it was AN AWESOME SIGHT.
(there were over 2500 people at this event)
...sorry if it sounds like i'm bragging, i'm not. Just reminiscing and feeling proud of the cool things i've been able to do with events.
j.r.