15) Andres Bermudez – engineering (track 18), engineering assistance (track 5) Angela Beyincé – songwriting (tracks 6, 9, 10, 16 and 17) Beyoncé – executive production, mixing (track 12), production (all tracks), songwriting (all tracks), vocal production (tracks 14 and 17), vocals (all tracks) Amund Bjørklund – songwriting (track 2) Tim Blacksmith – management Aaron Brougher – A&R coordination Denyse Buffum – viola (track 15) Bun B – songwriting (track 17), vocals (track 17) Eduardo "Visitante" Cabra – additional production (tracks 1 and 19), programming (track 1), remix production (track 19) David Campbell – string arrangement (track 15), string conducting (track 15) Roberto Cani – violin (track 15) Tim Carmon – keyboards (track 15) Sean Carrington – guitar (track 16) Jim Caruana – engineering (tracks 1–4, 6–14 and 17) Gustavo Celis – engineering (track 1), mixing (track 1) Olgui Chirino – vocal production (track 1) Fusako Chubachi – art direction, design Willie Clarke – songwriting (track 6) Andrew Coleman – engineering assistance (tracks 3 and 4) Larry Corbett – cello (track 15) Tom Coyne – mastering (tracks 1, 5, 7, 8 and 19) Jasmin Cruz – backing vocals (track 18) Scott Cutler – songwriting (track 15) Danny D. – management LaShawn Daniels – songwriting (track 16) Mario Deleon – violin (track 15) Ian Dench – songwriting (tracks 1 and 19) Robert "LB" Dorsey – engineering assistance (tracks 5, 7 and 8) Andrew Duckles – viola (track 15) Bruce Dukov – violin concertmastering (track 15) Nathan East – bass (track 15) Paco "El Sevillano" – gypsy chanting (track 18) Alejandro Fernández – vocals (track 18) Jaime Flores – songwriting (track 18) Paul Forat – A&R Brian "Big Bass" Gardner – mastering (tracks 2–4, 6 and 9–17) Sean Garrett – production (tracks 9, 13), songwriting (tracks 3, 6, 9, 13, 16 and 17) Amanda Ghost – songwriting (tracks 1 and 19) Jason Goldstein – mixing (tracks 2–4, 6 and 9–14) Aaron "Goody" Goode – horns (track 12) Erwin Gorostiza – art direction Max Gousse – A&R Alan Grunfeld – violin (track 15) Rich Harrison – mixing (tracks 10 and 11), production (tracks 10 and 11), songwriting (tracks 10 and 11) Geraldo Hilera – violin (track 15) Jean-Marie Horvat – mixing (tracks 1, 5, 7, 8 and 16) Dabling "Hobby Boy" Howard – engineering (track 15) Ty Hunter – styling ILoveDust – logo design Jun Ishizeki – engineering (track 12) Eric Jackson –