What does "rock lovelies" mean?

What does "rock" mean in the phrase, "A bevy of rock lovelies"? This was taken from Google's definition of "lovely" as a noun, which in turn seems to come from some dictionary by Oxford, such as the The Oxford Pocket Dictionary of Current English:

n. (pl. -lies) inf. a glamorous woman or girl: a bevy of rock lovelies.

In this context "rock lovelies" almost certainly means attractive female rock(-and-roll) musicians (or possibly attractive female hangers-on of rock musicians), so "rock" is just the adjective meaning something like "relating to rock-and-roll music".

I take it the Oxford Pocket Dictionary was meant to be a pared-down alternative to the Oxford Dictionary of English and the Oxford English Dictionary, squeezing as much information into as small a space as possible. The extended definition for this sense of lovelies given in the OED, 2nd Ed., is

3.a. absol. or sb. Now usu. a woman or girl of glamorous loveliness, esp. one who takes part in an entertainment or 'show'.

The OPD has apparently chosen to convey the emphasis on an entertainment/show connotation through use of an example of a common type of entertainment/show, but unfortunately chose an example that is not actually in common usage and that is therefore ambiguous.