Last August, the Killers talked about recording a “heavier” new album, the follow-up to 2021’s Pressure Machine and their first album all back together since 2017’s Wonderful Wonderful. (Pressure Machine didn’t feature bassist Mark Stoermer, who sat that one out due to the pandemic.) Well, now we appear to be getting a first taste of that “heavier” album, with the Killers debuting a new song, “Boy,” at Mad Cool Festival in Madrid tonight.