Jive (also known as Swing, Jitterbug, Lindy)
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Jive music is written in 4/4 time.

Rock 'n' Roll is a very good preparation for the beginner who wants to learn 
the Jive. The main difference between the two is that the Jive is danced in 
what is called TRIPLE RHYTHM as against the Single Rhythm of Rock 'n' Roll.
This triple rhythm is often counted as 3a4 and is called the Jive Chasse.
Note : Rock 'n' Roll is sometimes referred to as Single Beat Jive.

Single Lindy (Tempo : 34 to 48 bars/min)
Triple Lindy (Tempo : 30 to 40 bars/min)

Single Lindy is done in 6 counts with quick-quick-slow-slow.
Triple Lindy is done with 1 2 3 a 4 count or 1 2 3a4 3a4 count.

Jive : Rhythm
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Two different rhythms form the basis of Jive. 
The first  is based on one            bar of music, count is 12 3a4
The second is based on one and a half bar of music, count is 12 3a4 3a4
Most figures use the second construction (here shown below) :- 

          Bar  111111111111111122222222222222223333333333333333
         Note  1   2   3   4   1   2   3   4   1   2   3   4
    Drum Beat  b   c   b   c   b   c   b   c   b   c   b   c     b=boom c=cha
Rock and Roll  5   6   1   2   3   4   5   6   1   2   3   4
         Jive  1   2   3  a4   3  a4   1   2   3  a4   3  a4

Jive Step 1,2,4 takes four  quarters of a beat duration (a whole beat)
Jive Step   3   takes three quarters of a beat duration
Jive Step   a   takes one   quarter  of a beat duration (a quarter of a beat)

Note : The 5 and 6 steps of Rock 'n' Roll is the same as 

       the 1 and 2 steps of Jive

There is also a DOUBLE RHYTHM or TWO BEAT JIVE, where the three steps used in 
the triple rhythm are replaced by a 'tap-step' movement counted as 3 4
Part of body weight is placed on count 3 and full weight on count 4 
completely omitting the change of weight onto the other foot on the 'a' count.
This double rhythm method is quite attractive, but should be used only occa-
sionally as an interpretative variation of rhythm whilst dancing the normal 
triple rhythm jive. Excess use of the double rhythm can give an impression of 
laziness and lack of musical expression.
The triple rhythm must be used for competitions and medal tests under the 
British Council of Ballroom Dancing rules, at a tempo of about 44 bars/min.