How many know that after a Link which is 1 2. The first step of Closed Promenade must be on 3 4. with the music. In a 2/4 Tango it wouldn't matter. The Link would be 1 2. and the step out would be 1 2
Not quite.
In 2/4 the quantities are cut in half. To translate a piece of music from 4/4 to 2/4, you would cut all the note values in half, such that all half notes would become quarter notes, and all quarter notes would become eighth notes. In ballroom dancers' terms, that means that slows become 1 beat and quicks become a half-beat.
Take a pattern such as two walks and a link, with the rhythm "Slow, slow, quick quick". In 4/4 time, that rhythm counted numerically would be "1,(2), 3,(4), 1,2". (Numbers in parentheses are without steps). However, the same rhythm in 2/4 time would be "1 (and) 2 (and) 1 AND".
You may find it easier to look at the following chart:
S/Q count: "S---S---Q-Q-"
4/4 count: "1 2 3 4 1 2 "
2/4 count: "1 & 2 & 1 & "
Following this guideline and referring back to Serendipidy's Link and single promenade walk, the 2/4 count will therefore be "1 AND" for the link, and "2 (and)" for the prom walk. Or, if you're the type of competitor who likes the "delayed" take-off in promenade, then you could modify it to "(2) AND" for the prom walk. You can see how this is very different from the way he (she?) counted, because he forgot to account for the modified beat values.
Very few dancers understand 2/4. They generally count 2/4 music as though it were 4/4, because they don't know the difference. It really doesn't create too many problems in the practical sense, but I think one should at least understand what it means to count in 2/4, even if one never actually does so in real life.
All dancers should minimally understand that "slows" and "quicks" are not a rigidly defined quantity; They are merely a concept of relative time. Typically a slow is two beats and a quick is one, but not necessarily. Music counted in 2/4 time is one such exception.
Regards,
Jonathan Atkinson
www.ballroomdancers.com