British act Bastille and DJ/producer Marshmello have the Number One song at modern rock radio with “Happier,” and it’s also the first track by two co-lead artists to top the Billboard Alternative Songs chart in the survey’s 30 year history. It’s also Bastille’s second chart-topper after its 2013 breakthrough hit “Pompeii” and its eighth straight Top 10 single. “Happier” has also yielded more than 22 million streams and 23,000 paid downloads.