I was looking up the bios of some of my favorite groups and I noticed some of these groups were labeled "singing groups" and others were labeled "vocal groups". Like I've seen the Temptations and Boyz II Men labeled "vocal groups" and Jodeci and Dru Hill labeled "singing groups". Does anyone know what's the difference between the two if there is any?

[Edited 3/8/11 14:45pm]

[Edited 3/8/11 14:46pm]