5 Seconds of Summer •
Luke Hemmings – guitar, lead vocals (tracks 1–8, 10–16, 18), keyboards (tracks 1–6, 8, 10–13, 15–19), backing vocals (tracks 1–6, 8–15, 17–19), producer (track 8), instrumentation (tracks 5, 8),
programmer (tracks 5, 8) •
Michael Clifford – guitar (tracks 1–2, 4–19), lead vocals (tracks 1–2, 10, 12–13, 15, 17–18), keyboards (tracks 1–6, 8, 10–13, 15–19), backing vocals (tracks 1–6, 8–19), producer (tracks 1–2, 5–8, 12–15, 17–18), instrumentation (tracks 1–2, 5–8, 12, 14–15, 17–18), programmer (tracks 1–2, 5–8, 12–15, 17–18), vocal producer (track 4) •
Calum Hood – bass guitar, lead vocals (tracks 1, 6, 8–10, 13, 15, 18), guitar (track 11), keyboards (all tracks), backing vocals (tracks 1–6, 8–19), producer (track 8), instrumentation (track 8), programmer (track 8) •
Ashton Irwin – drums, lead vocals (tracks 8–9, 11, 19), keyboards (tracks 1–6, 8–13, 15–19), backing vocals (tracks 1–6, 8–19), producer (track 8), instrumentation (track 8), programmer (track 8)
Additional musicians •
James Abrahart – background vocals (track 3) •
Colin "Doc" Brittain – keyboards (track 9) •
Sierra Deaton – lead vocals (track 7) •
Jason Evigan – guitar (track 3),
synthesizer (tracks 3–4) • Elijah Noll – backing vocals (track 19) •
Michael Pollack – keyboards (track 7) • Jacob Scesney – saxophone (track 10) •
Sly – keyboards (track 16) • Mark Schick – guitar (track 3) •
Peter Thomas – keyboards (track 10), background vocals (track 10)
Technical personnel •
Neal Avron –
engineer (tracks 1, 5–6) • Courtney Ballard – engineer (track 2) •
Jon Bellion – producer (track 4) • Chris Bennion – assistant mix engineer (track 2) • Michael Bono – engineer (track 11) • Bryce Bordone – assistant mixer (tracks 4, 16) • Colin "Doc" Brittain – producer (tracks 9, 19), instrumentation (tracks 9, 19), programmer (tracks 9, 19), vocal producer (tracks 9, 19) • Zander Caruso – additional production (tracks 6–7), instrumentation (track 7), programmer (track 7), additional programmer (track 17), drum programmer (tracks 15, 17) • Lionel Crasta – engineer (tracks 3–4), vocal producer (tracks 3–4) • Tommy Dietrick – engineer • Jason Evigan – producer (tracks 3–4), drum programmer (tracks 3–4), vocal producer (track 3) • Rafael Fadul – engineer (tracks 3–4) •
John Feldmann – producer (tracks 11–12), instrumentation (track 11), programmer (track 11) • Michael Freeman – engineer (tracks 8, 12, 15, 17, 19) •
Chris Gehringer – engineer (tracks 1–19) •
Serban Ghenea – engineer (tracks 4, 16) • Eli Heisler – assistant mixer (track 7) • Cameron Hogan – engineer (tracks 3–4) • Wylie Hopkins – producer (track 13), instrumentation (track 13), programmer (track 13) • Andy Inadomi – engineer (tracks 7, 15) • Chris Kasych – engineer (tracks 2, 4–6, 8, 12–14) • James Krausse – engineer (track 2) •
Rob Kinelski – engineer (track 7) • Kevin McCombs – engineer (track 9, 19), additional production (tracks 9, 19) • Dylan McLean – engineer (tracks 11–12) • Jacob Munk – engineer (tracks 1–2, 6, 18–19) •
Pete Nappi – producer (track 4) • Tim Nelson – additional production (track 1) •
Chris "Tek" O'Ryan – vocal producer (track 1) • Matthew Pauling – producer (track 8), engineer (tracks 2–6, 8, 10, 15–16), instrumentation (track 8), programmer (track 8), vocal producer (track 6) • Jackson Rau – engineer (tracks 3–4) • Scott Skrzynski – assistant mixer (tracks 1, 5–6) • Tyler Spry – additional production (tracks 2, 18) • Sly – producer (track 16), engineer (track 16), instrumentation (track 16), programmer (track 16) •
Spike Stent – engineer (tracks 2–3, 9–11, 13–14, 18) • Scott Stewart – engineer (tracks 11–12) • Peter Thomas – producer (track 10), engineer (track 10), drum programmer (track 10) • Josh Thornberry – engineer (tracks 11–12) • Jake Torrey – additional production (track 10) • Matt Wolach – assistant mixer (tracks 2–3, 9–11, 13–14, 18) •
Rami Yacoub – producer (track 16), engineer (track 16), instrumentation (track 16), programmer (track 16) ==Charts==