"Greek salad number"

Looking for definition and etymology for "Greek salad number." It is used in a review of a Broadway show "As The Girls Go" published in the Sunday, January 2, 1949 Evening Star newspaper (Washington (DC), District of Columbia) on page 97. Here is the quote: "When producer Todd spills all his several dozen beautiful young women on the stage in what is known as a Greek salad number, the Elephants stand out head and shoulders above the dancing girls."

The article defines "elephants" as old-fashioned 6 foot showgirls with huge headdresses: "These goddesses were known in the trade as 'elephants,' possibly to distinguish them from dancing girls, called 'ponies.'"

Here's a link to the article, which may be subscription only: http://bit.ly/1NW1Nke