I dunno, for me, although I wouldn't draw any direct connections between Pascal's "Rock and Roll" quote and Mark Ronsons hiring, I do think it (along with everything else we've seen since then) tips me further towards the notion that Amy Pascal was speaking deliberately and purposefully. 

That she didn't just misspeak, or respond sarcasticly, or even just use an off-hand metaphor etc. 

I still don't think she meant literal rock music, but I'm leaning towards her hinting at an overall artistic choice in the film that we are still not fully privy to. 

When I first heard the comment, I thought it meant something like "everything's ready to start."

However, now knowing that Greta has shifted the timeline, by the time we get to meet the Pevensies, it would be the 90s when grunge/alternative rock was at its height. I'm wondering if we might see a Susan who is obsessed with Nirvana/Kurt Cobain. Just a thought.  

Here's the Wikipedia page for the 1955 top-selling single records. I noticed, in reading this article, that until 1952, the top songs chart was based on sales of sheet music of the song, not recordings. Interesting.

This chart shows a lot of what I think of as my parents' music for most of it, but in October there arrived the iconic Rock Around The Clock.

https://en.wikipedia.org/wiki/List_of_UK_top-ten_singles_in_1955

Posted by: @icarus

... having had all day thinking about it, I'm going to surprise myself here and say that my outside bet for this comment is actually somewhere closer to specific thematic reference than anything else.

You see, the thing is, I've become ever more convinced in the last few weeks that Greta Gerwig is going to make The Magician's Nephew as the first film, and I keep coming back to the scene where Aslan sings the universe into creation. Its such a weird and difficult to visualise sequence, and I'm trying to imagine how Greta Gerwig might bring that to life, and how she might explain that sequence to a producer like Amy Pascal.

In essence I'm trying to imagine that conversation, and the words I can imagine Greta might have used would be things like "cosmic" "psychedelic" "trippy" "operatic" and yes, maybe even "rock and roll" - though for reference i'm thinking of something more like the intro to Time by Pink Floyd, rather than say anything by AC/DC.

Do I get points for predicting Pink Floyd? 😉 😂