sentence: personnel ; red hot chili peppers anthony kiedis -- lead vocals flea -- bass , backing vocals john frusciante -- lead guitar , backing vocals , keyboard chad smith -- drums ; additional musicians greg kurstin -- keyboards patrick warren -- chamberlin organ on '' road trippin ' '' ; recording personnel lindsay chase -- production coordinator mike nicholson and greg collins -- additional engineering greg fidelman -- additional engineering jennifer hilliard -- assistant engineer chris holmes -- mix engineer ok hee kim -- assistant engineer vlado meller -- mastering rick rubin -- production david schiffman -- additional engineering jim scott -- engineer , mixing john sorenson -- additional engineering ; additional personnel lawrence azerrad -- art direction sonya koskoff -- photography red hot chili peppers -- art direction tony wooliscroft -- photography charts , certifications and sales album certifications singles references bibliography dimery , robert .