– harmony and backing vocals on “Livin’ With a Heartache” Joe Walsh – slide and rhythm guitars on “Keepin’ the Summer Alive” Steve Ross – guitar Bill House – guitar; acoustic guitars on “Oh Darlin’” Caleb Quaye – lead and rhythm guitars on “School Day”, guitar on “Sunshine” Billy Joe Walker, Jr. – lead and acoustic guitars on “Livin’ With a Heartache” Dennis Budimir – guitar on “School Day” Tim May – guitar on “School Day” Al Vescovo – guitar on “When Girls Get Together” Bryan Garofalo – harmony and backing vocals on “Keepin’ the Summer Alive” and “Endless Harmony”, bass Jerry Scheff – bass on “Oh Darlin’” Ray Pohlman – bass on “School Day” and “When Girls Get Together”, mandolin on “When Girls Get Together” Lyle Ritz – double bass on “Santa Ana Winds” John Hobbs – keyboards Daryl Dragon – keyboards on “Some of Your Love” and marxophone on “When Girls Get Together” Don Randi – keyboards on “School Day” Mike Meros – keyboards on “School Day” Carli Muñoz – organ on “School Day” Ricci Martin – keyboards on “Sunshine” and piano on “Endless Harmony” Scott Mathews – drums; harmony and backing vocals on “Goin’ On”, percussion on “When Girls Get Together” and “Endless Harmony” Ricky Fataar – drums on “Keepin’ the Summer Alive” and “Sunshine” Gary Mallaber – drums on “Livin’ With a Heartache” and percussion on “Sunshine” Hal Blaine – drums on “School Day” Steve Forman – percussion Gene Estes – tympani on “When Girls Get Together” Steve Douglas – saxophone on “Oh Darlin’”, “Goin’ On”, and “Sunshine” Joel Peskin – saxophone on “Oh Darlin’”, “Goin’ On”, and “Sunshine”; baritone saxophone on “Some of Your Love” Dick “Slyde” Hyde – trombone on “Oh Darlin’”, “Goin’ On”, and “Sunshine” Chuck Findley – flugelhorn on “Oh Darlin’”, trumpet on “Goin’ On” and “Sunshine” Lew McCreary – trombone and bass trombone on “When Girls Get Together” Jim Horn – baritone saxophone on “When Girls Get Together” Vince Charles, Efrain Toro, Ray Armando – steel drums on “Sunshine” David Sherr – oboe on “When Girls Get Together” Alexander Neiman, Darrell Terwilliger – violas on “When Girls Get Together” Armand Kaproff, Jan Kelley, Harold Bemko, Douglas Davis – cellos on “When Girls Get Together” Tommy Morgan – harmonica on “Santa Ana Winds” Igor Horoshevsky, Raymond Kelley – cellos on “Santa Ana Winds” James Getzoff, Murray Adler, Bonnie Douglas, Paul Shure, Alfred