Please help me ID this song-- Chairlift?

Hi! I've been a lurker for a long time and you guys are all so helpful... but I still haven't been able to ID this song.

I heard it in Forever 21 in March, and it featured a woman singing. It could have been Lesley Feist or maybe Chairlift? Or maybe not, but the vocals were very atmospheric.

It was a very mellow song.

The lyrics had to do with 'run away from your father' and 'the old ways are dead and gone.'

But when I google this, the only thing that comes up is Jamie Walters, and I assure you, it's not him.

Any help is GREATLY appreciated! I'll try to get you back sometime...

Thanks!

I'm pretty sure it's Dog Days are Over by Florence and the Machine.