Well, we know from past posts that music is very important to Pansy. We also saw that in her Marie-induced dreams, music and her father seemed really closely linked. (daddy's singing to me (http://alt-pansy.livejournal.com/4422.html)...) And some of her blood-traitor thoughts were expressed by referencing her father's songs ("lucius is macheath"). It seems like her love of her father and her sympathy for Muggles and her love of her father's Muggle music are all intertwined somehow. So I could see Lucius trying to weaken that association by exposing her to as much wizard music as possible. If he can get music to remind her of the Malfoys and pureblood accomplishments rather than her father and Muggles, he will have made a significant step in his effort to reprogram her.

I've been so monstrously bad. I have been questioning things that I ought not and Lucius explained everything to me. I had thought, see, from hearing music of my father's, that it was muggle music I was hearing but no! It's opera and it's beautiful and Lucius explained that it's wizard music. (http://alt-pansy.livejournal.com/4337.html)

Lucius let me listen to music with him. I think he said it was Rossini (but I could be wrong) and it was lovely. And Mozart. There was what Lucius said was a piano concerto and the piano sounded like rippling water to me. I love music. (http://alt-pansy.livejournal.com/8400.html)

So my theory is that the package of music comes from Lucius.