Hi Jacob: I don't know the reason, but I'm not entirely convinced its market research, because I believe these styles are pretty much universally recognized (at least among most pop-rock-blues musicians) as 12/8, or 4/4 styles with a 12/8 (triplet) feel, with 6-8SlowRock1 & 6-8SlowRock2 suitable for those classic 12/8 rock ballads.

Each of these styles include four quarter note beats per measure, confirmed by the fact that the keyboard's metronome light flashes four times/measure. In addition, the sub-rhythm of each quarter note contains a triplet (three 8th notes) of which adds up to: 12 beats per measure, not 6 as suggested by the 6/8 style name assigned by Yamaha. 6/8 would only represent 1/2 of the style's measure.

I realize this debate may appear overly academic & pedantic, but Yamaha's 6/8 style naming conventions here have caught the attention (and quibble) of more than quite a few of my gigging musician associate friends as well. - Scott