(1, 6, 13, 14, 15, 18), lead vocals (2, 7, 12), arrangements (2, 7, 16, 18, 12), backing vocals (3, 18), muted trumpet (14), brass arrangements (17, 18), piccolo trumpet (18), BGV arrangements (18) James Pankow – trombone (1-8, 10-18, 20), brass arrangements (2-6, 8, 10-18, 20), synth keyboards (4), flute arrangements (9), arrangements (10, 13, 16, 19), vocal arrangements (19) Walter Parazaider – tenor saxophone (1-6, 8, 10-18, 20), alto flute (1, 9), alto saxophone (6, 7, 13, 14, 16), flute (6, 7, 13, 14, 16), C flute (9) Jason Scheff – bass (1, 2, 3, 5, 7, 8, 9, 12, 16), backing vocals (1, 2, 3, 6-14, 16, 18, 20), lead vocals (4, 5, 7, 9, 12, 13, 16), electric upright bass (4, 6, 15, 18, 20), keyboards (9), computer programming (9), arrangements (9), BGV arrangements (9, 10, 13), fretless bass (11, 14), electric bass (17) Additional musicians Roy Bittan – organ (4, 10, 18), accordion (4, 6, 18), keyboards (13), synth bells (18), acoustic piano (19) George Black – computer programming (9, 13, 18, 19) John Durill – synth keyboard (18), additional arrangements (19) Tim Pierce – guitars (4, 11), acoustic guitars (9, 19) Luis Conte – percussion (4, 6, 8, 9, 16, 20) Larry Klimas – baritone saxophone (3, 10) Nick Lane – additional arrangements (1) Carmen Twillie – backing vocals (6, 11, 20) Adult choir on "The Little Drummer Boy" Carmen Twillie – choir director Alex Brown, Tamara Champlin, Alvin Chea, Gia Ciambotti, H.K. Dorsey, Gary Falcone, Edie Lehmann Boddicker, Bobbie Page, Oren Waters, Maxine Waters and Mona Lisa Young – choir Children's choir on "Child's Prayer" and "One Little Candle" Ryan Kelly – children's choir conductor Amity Addrisi, Michael Amezcua, Alex Bittan, Ryan Bittan, Clark Gable, Kayley Gable, Kate Lamm, Sean Lamm, Dylan Loughnane, River Loughnane, Sarah Pankow, Brittany Scott and Jade Thacker – lead vocals Production Chicago XXV Produced by Roy Bittan Engineered and Mixed by Ed Thacker Assisted by Posie Muliadi and Eric Ferguson Recorded at A&M Studios (Hollywood, CA); Rumbo Recorders (Canoga Park, CA); Gold Mine Studio (Woodland Hills, CA). Mixed at A&M Studios Production Coordinator – Valerie Pack Art Direction and Design – John Kosh "What's It Gonna Be, Santa?" Produced by Phil Ramone Engineered and Mixed by Ed Thacker at Glenwood Place Recording Studios (Burbank, CA). Additional Production – Chicago and David McLees Sound Supervision – Lee Loughnane and