I didn't realize you'd written this when I wrote my own little piece on memory.
My best mates Dad just died recently after a long period of dementia. What remained were the ability to play ball (he was a mad sportsman) and his affection. It's such a difficult disease. Despite the abject pain Dad was in, he said he'd rather go with his wits about him. We joked, what wits? - but we're glad too.
As I said in my comment before, they say music brings memory to life and being a music lover, I'm sure this will also be true for you.
It's lovely you got time to spend with her. Family is important to you so I'm sure you'll hold their memory as close as you can, and keep them alive that way.
I don't have much music memories from my grandparents, but a lot from my parents. Classical music is mom, rock and world music is dad. Both love Pink Floyd, so that's an important one for me, too - and their music is just awesome. We'll be going through mom's old vinyls in a couple of days, see what she still listens to, and what not. I remember that she has The Wall, The Division bell and The Dark Side Of The Moon. I hope those are still around...
Dark side of the moon was the first album Dad played when he got his brand new sound system in the 70s. It's a good one to test stereos! And we listened to it on his extremely expensive speakers just before he went to play guitar in heaven. Heard stuff we hadn't noticed before. It's a good one.