There is a song by the Andrews Sisters from the 1940s whose lyrics talk about a difference between eight-beat rhythm and four-beat rhythm. For example:
The boogie woogie was never like this,
We've got a new beat that no one can miss,
if Boogie woogie sent like I think it did,
Four to the bar will flip your lid.
I do not understand the difference, or why "Little Brown Jug" is a particularly good example of a song which is in four. I thought boogie woogie is in 4/4 time anyway? I would like examples of music which would help me to understand what two types of rhythm the song is talking about and how to hear the difference between them.