But Karthik didn't have her number. All he had was the memory of her smile when the DJ had played that very track. She had leaned over and shouted above the music, "This song feels like my name being called out loud!"

Page after page of sketchy websites. "Download now — free!" some promised, but they were littered with pop-ups and broken links. Others asked for permissions to his contacts. One site even tried to install a "speed booster" app that was clearly malware. Frustrated, he almost gave up.

Now, hunched over his phone at 2 a.m., Karthik typed into a search bar: