- Panic at the Disco
- Brendon Urie – vocals, guitars, bass guitar, ukulele, piano, keyboards, synthesizers, harpsichord, organ, programming
- Ryan Ross – vocals, guitars, harmonica, composer, lyrics
- Jon Walker – bass guitar, guitars, backing vocals
- Spencer Smith – drums, percussion, backing vocals
- Additional instruments
- Michael Davis – trombone
- Isobel Griffiths – orchestra contractor
- Tony Kadleck – trumpet
- Jeff Kievit – flugelhorn, piccolo trumpet, trumpet
- Peter Lale – viola
- Chris Laurence – double bass
- David Andrew Mann – clarinet, sax (alto)
- Hearth Rob Mathes – producer
- Rob Mathes – additional guitars, keyboards, mandolin, piano, orchestal arrangements
- Perry Montague-Mason – violin
- Sandra Park – concert master, string contractor
- Tony Pleeth – cello
- Eric Ronick – wurlitzer (on "Mad As Rabbits")
- Roger Rosenberg – sax (baritone)
- Andy Snitzer – sax (tenor)
- Warren Zielinski – violin
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- Production
- Jonathan Allen – engineer
- Ilene Budin – packaging manager
- Damon Chesse – prop design
- Peter Cobbin – mixing
- Anne Declemente – A&R
- Anthony Franco – stylist
- Mark Gray – assistant engineer
- Scott Hull – mastering
- Peter Hutchings – mixing assistant
- Lewis Jones – assistant engineer
- Alex Kirzhner – art direction, creative director, illustrations
- Richard Lancaster – mixing assistant
- Connie Makita – illustrations
- Claudius Mittendorfer – engineer
- Jennifer Tzar – photography
- Tanapan "Bang" Puangpakdee – illustrations
- Pete Wentz – A&R
- Alex Venguer – engineer
- Wayne Warnecke – engineer
- Rob Mathes – producer
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