3OH!3, the duo behind such ’00s trash-pop hits like “Don’t Trust Me” and the Katy Perry-featuring “Starstrukk,” are back. Their first new single in four years is a collaboration with 100 Gecs, another duo who clearly have an affection for the kind of digital ruckus that 3OH!3 were making over a decade ago. Their team-up, which is called “Lonely Machines,” is out now and it signals a new era for the group, who started teasing their return a few days ago. Check it out below.