of Flicker. Personnel and musicians Niall Horan – lead vocals, guitar Maren Morris – featured artist AFTERHRS – synthesizer Vern Asbury – guitars Tom Barnes – drums , percussion Alisha Bauer – cello Eli Beaird – bass guitar Daniel Bryer – background vocals Julian Bunetta – background vocals , percussion , drums , piano , bass guitar , guitar , keyboards Ann Marie Calhoun – violin Matt Chamberlain – drums Daphne Chen – string quartet , violin Irina Chirkova – cello Ruth-Anne Cunningham – background vocals Eric Darken – percussion Dave Emery – keyboards Ian Fitchuk – drums , piano Ian Franzino – bass guitar , drums , guitar , keyboards Ilona Geller – viola Mark Goldenberg – guitar Eric Gorfain – violin Andrew Haas – bass guitar , drums , guitar , keyboards Jedd Hughes – electric guitar John Joseph – bass guitar Leah Katz – string quarter , viola Peter Kelleher – organ Tommy King – keyboards , organ Sam Klempner – background vocals , bass guitar Ben Kohn – claps , bells Greg Kurstin – acoustic guitar , bass guitar , drums , guitar , piano , keyboards , electric guitar , synthesizers Greg Leisz – acoustic guitar Todd Lombardo – acoustic guitar Val McCallum – guitar Mike Needle – background vocals Zac Rae – piano , synthesizers John Ryan – background vocals , guitar , bass Bridget Sarai – background vocals Jamie Scott – background vocals Aaron Sterling – drums , percussion Chris Stills – background vocals Spencer Thomson – acoustic guitar , electric guitar , guitar Leah Zeger – violin Production AFTERHRS – production , recording , additional production , programming Chris Bishop – additional vocal engineering Daniel Bryer – additional programming Julian Bunetta – production , recording , programming , additional recording Julian Burg – recording Nathan Dantzler – mastering Eric Darken – drum programming Brendan Dekora – recording assistant Dave Emery – programming Ian Franzino – programming Michael Freeman – mixing assistant Eric Gorfain – string arrangement Eric Greedy – additional recording Andrew Haas – programming Martin Hannah – recording Jacquire King – production , recording , programming , session conductor Sam Klempner – additional engineering Greg Kurstin – production , recording , string arrangement , drum programming Kolton Lee – vocal editing Alex Pasco – recording John Rausch – recording Jamie Scott – recording , additional programming Mark "Spike" Stent – additional