It was probably plainly obvious that Ginny was pleased when he actually seemed to be enjoying himself. She knew her son's fake 'I'm only trying to amuse you' smile from his real one, and this one appeared to be a real one. She felt a nice mix of happy, smug, and relieved at once. The chance to get out was probably doing him good. Had he even left the property of the Weir since he had been back? It was too long for a teenage boy to be stuck inside.
Ginny looked at the book he was holding, actually interested in what it was. She'd never been much of a reader, and Harry was never a 'book nerd,' she figured it was the Percy in him, and magically, the Hermione in him, even if there was no blood relation there. Or maybe he and Rose had just spent too much time together growing up. It didn't matter though, he had his interests, and she was proud of him. "Would you like it?" she asked, bringing her attention back from the book, to her son.
"A whole band?" she asked, the image of someone trying to be an entire band slightly amusing her. "That does sound interesting. Shall we keep an eye out for him then?" it was an act she wouldn't mind seeing. Being a one man band was talent, now the question would be, was he any good?
She looked down to the book section, running a hand over some of the selections that was available. Maybe she'd pick up something for Hermione while she was here, she would probably find enjoyment in some of them. Though, being muggle born, she probably already knew a lot about these books. Or much more than she did anyway. Maybe for Rose then, who may not know as much.
"There's supposed to be a magic act in a half an hour as well." she'd glanced at a schedule earlier, scanning some of the acts. "It's sort of interesting, how Muggles work their own magic. Might be interesting to see?"