For the sake of the hypothetical, let's say they're not frozen in 2009/2013 culture and have access to modern music
What do you think they'd be a fan of?
I'll chip in a freebie: I think Dave would be a longtime listener to Tyler the Creator but his relationship to Tyler's music would be extremely volatile - I think he'd be really into the earlier eras and period in Tyler's career (Goblin, bastard, Wolf) but find himself conflicted and probably even provoked when he'd get to stuff like Flowerboy, Igor, etc
Basically I think at some point Dave would cry while listening to "Like Him" thank you for coming to my Ted Talk