Steve Lukather – guitars (6), guitar solo (7) Peter Banks – guitars (8) [uncredited] Abraham Laboriel – bass guitar (2, 3) Joe Chemay – bass guitar (4, 7, 8) Nathan East – bass guitar (5) Paul Leim – Simmons drums (1), drums (3, 4, 8) John Robinson – drums (2, 6) Jeff Porcaro – drums (7) Paulinho da Costa – percussion (2, 7) Charlie Loper – trombone (2) Bill Reichenbach Jr. – trombone (2) Chuck Findley – trumpet (2) Gary Grant – trumpet (2) Jerry Hey – trumpet (2) James Anthony Carmichael – arrangements (1), horn arrangements (2), string arrangements (2–4, 8), rhythm arrangements (3–5, 7, 8) Jeremy Lubbock – string arrangements (6) Israel Baker – concertmaster (3, 4, 6) Harry Bluestone – concertmaster (8) Melinda Joyce Chatman – vocal sound effects (2) Calvin Harris – backing vocals (2) Richard Marx – backing vocals (2, 5–7) Deborah Thomas – backing vocals (2, 5, 7) Kin Vassy – backing vocals (2) Jeanette Hawes – backing vocals (6) Chant vocals on "All Night Long" Diane Burt James Anthony Carmichael Melinda Joyce Chatman David Cochrane Dr. Lloyd Byro Greig Calvin Harris Jeanette Hawes Janice Marie Johnson Brenda Harvey-Richie Richard Marx Deborah Joyce Richie Lionel Richie Suzanne Stanford Deborah Thomas Hoopa Hollers on "All Night Long" Marilyn Ammons Sue Ann Butler Melinda Joyce Chatman Sheldon J. Cohn, Esq. Sandy Dent-Crimmel Ruth Diaz David Egerton Sylvia Genauer Rejauna Lynn Green Gabrielle Greig Sally Greig Tanya Greig Darryl Jones David Malvin Alison Maxwell Jerry Montes John Michael Montes Billy "Bass" Nelson Greg Phillinganes Carlos Rios Suzanne Stanford Randy Stern Wilbert Terrell Susan Wood Production James Anthony Carmichael – producer (1–5, 7, 8) Lionel Richie – producer (1–5, 7, 8) David Foster – producer (6) Brenda Harvey-Richie – production assistant Melinda Joyce Chatman – production coordinator Calvin Harris – recording and mixing engineer Steve Crimmel – second recording engineer (1–5, 7) David Egerton – second recording engineer (1–5, 7) Mark Ettel – second recording engineer (1–5, 7) Larry Ferguson – recording engineer (6) Humberto Gatica – recording and mixing engineer (6) Terry Christian – second recording engineer (6) Jim Cassell – second recording engineer (8) Jane Clark – additional engineer Fred Law – second mixing Karen Siegel – second mixing David Kraai – technical support Bernie Grundman – mastering at A&M Studios (Hollywood, California) Rita Leigh – creative assistant Johnny Lee – art direction Chris Callis –