Jack of Speed lyric - 'trading fours'

[f***@embarqmail.com]

Normally, I don't spend huge amounts of time trying to decode Dan
phrases I don't comprehend, but this one's got me intrigued. Does
anyone know what 'trading fours' means?
"Better move now, little Darlin', or you'll be
Trading fours with the Jack of Speed"
I assume that 'trading fours' implies a close and active association
of some kind, and that the lyric serves as a warning that the person
being addressed would become hooked herself.
But is 'trading fours' a phrase in common usage anywhere other than in
this song? (My only conjecture is that it might be a term used by
musicians meaning to trade off taking the melody 'four bars at a
time', sort of like a duet)
Thanks!!
Nick Yeast

TRADING FOURS IS A JAZZ MUSICIAN'S PHRASE. IT MEANS WHEN SOLOISTS PLAY A 4 BAR PHRASE, THEN HAND IT TO THE OTHER SOLOIST WHO, IN TURN PLAYS A 4 BAR PHRASE. THIS TRADING PHRASES BACK AND FORTH (MUSICAL SPARRING, IF YOU WILL) IS A WAY TO TEST THE OTHER PLAYERS ABILITY TO IMPROVISE ACROSS A SET OF CHORD CHANGES AND CAN ALSO LEAD TO A BUILDING IN INTENSITY TO THE MUSIC. THIS CAN BE DONE ONCE OR MANY TIMES, DEPENDING ON THE SETTING AND COMPOSITION.

[The old geezer]

I really like this song!!

[Paul Snyder]

Post by The old geezer
I really like this song!!

There's something else that can be put into the interpretation too, that shows how literate and smart the Dan-sters are. Definitely the musical reference applies. But I'm sure Walter and Donald know that in Chinese iconography, the character for 4 is the same as the character for death. That's why Chinese (and Japanese, who use many of the Chinese characters in their writing) don't like the character for 4 in their addresses, or for example listing prices for real estate, and other such things. And why, on the other hand, the number 8 is highly favored and considered good luck, because the character for 8 is the same as the character for wealth and fortune. Here in Hawaii, where there are many buyers of real estate from China and Japan, list prices often end or start in 888, as in $950,888, or $888,000. You never see a price begin or end in 444. If you're "trading 4's", you're playing a card game with death. If you're doing speed, that's the same game. Better take your money and push away from the table, little darling.