It’s not true that Haim, the L.A.-based band of sisters, never dreamed they’d be on the edge of superstardom—or even that their latest hit, “Want You Back,” would wind up on everybody’s summer-anthem playlist. It’s difficult, in fact, to imagine three people who might have put in more time dreaming about rock ’n’ roll: Este, 31; Danielle, 28; and Alana, 25, aside from being smart and fun and often hilarious, are self-described rock nerds. So the moment they came home from their first world tour two years ago—still riding the wave of the out-of-the-blue success of the their first album, Days Are Gone—they immediately recognized a classic nightmare scenario: songwriter’s block.
“You’re thinking, Can I still do this?” remembers Danielle. “And you’re looking at a blank sheet of paper.”
“You…
