Don wrote:
Swing is from side to side. and sway comes in on three.
Not exactly.
Swing by definition takes place on an arc. Think of how you swing a bat, a golf club, or a hammer. These are all ramges of motion taking place in different planes, but all in the shape of an arc.
The second thing all swinging actions have in common is that they require a free release of energy. For example, if you were to hold the seat of a playground swing and guide it slowly through its range of motion, it would not be perceived as "swinging". In order to swing, it needs to be sent with a free release of energy.
So here is how I would define swing: "The free release of energy through an arc".
As I illustrated with the baseball batt, golf club and hammer example, the swinging action is not necessarily tied to any one plane of motion. So you can see, then, why it shouldn't be confused (or even compared, for that matter) to sway. Sway is a position, while swing is a range of motion. Or several ranges of motion, actually... only one of which results in sway.
The range of motion that results in sway is "pendulum" swing, occurring in the same plane as the golf club. But don't forget about the equally important "rotary" swing (like the baseball batt), which has nothing to do with sway. Rotary swing results in... you guessed it... rotation. Or in ballroom terms, progressive rotation.
Coming back to the concept of "free release" -- this is the most oft overlooked aspect of swing. It is the key ingredient in your basic natural and reverse turns, and without it, you will not "swing". This is why Tango, although it rotates, doesn't "swing". It's also why social dancers often lack that "swinging" quality, even though they may be rotating and even finishing in a swayed position. There must be a free release of energy, or there is no swing.
So now back to the observation: "Swing is side to side". It has the following problems: (1) There is no arc in side-to-side motion, (2) It confuses swing, which is an action taking place through a range of motion, with sway, which is a position, and (3) It neglects the other possible ranges of swinging motion, such as rotary swing.
Now to the second observarion: "Sway comes in on 3". Actually, 3 is the beat where sway is dissolved. It is at its maximum, which is really its endpoint, right on the downnbeat of 3. You might hold it for a brief moment, but for the most part, the duration of 3 is spent dissolving the sway. As to where it "comes in", that depends on who you talk to. Some (myself included) will say it begins at the tail-end of 1, while others insist it doesn't begin until 2. We can have that discussion another day. Either way, 2 is the beat most charatcerized by sway, while 1 and 3 are spent, at most, only partly in a sway position.
Regards,
Jonathan Atkinson