I think that’s different for everyone, and #your headcanon may vary, so your headcanon is as valid as any! Who knows how true to canon the new adaptation will be? It would be fine with me if they want to update his musical taste/sound, as long as it seems in character. 

But canon-wise, Lestat awoke in the mid-80s, before MCR was formed. AR wrote TVL w/ the 70′s and 80′s in mind. She’s mentioned Bon Jovi was a major Lestat muse for her (she even included him on the PL dedication page).

There’s fanon that Lestat loves Bruce Springsteen, too. So I’d say he would sound like a mix of Guns ‘n Roses, Bon Jovi, and Bruce Springsteen.

When whoever was in charge chose Korn to be the sound for Lestat’s band in movie!QOTD, they weren’t aiming for canon accuracy, but it was an interesting take on it. 

There’s also a Lestat band on FB you can check out, I think they officially got AR’s permission to use the name.