▁every ▁year . ▁Econom ic ▁reports ▁show ▁that ▁the ▁festival ▁has ▁a ▁large ▁impact ▁at ▁Salvador ’ s ▁local ▁economy . ▁ ▁History ▁In ▁ 1 9 5 0 , ▁Ad ol fo ▁D od ô ▁N asc imento ▁and ▁Os mar ▁Ál var es ▁Mac ê do , ▁better ▁known ▁as ▁D od ô ▁and ▁Os mar ▁created ▁the ▁F ob ica , ▁an ▁open ▁float ▁adapted ▁for ▁musical ▁present ations , ▁and ▁the ▁tri o ▁el étr ico ▁was ▁born . ▁By ▁ 1 9 5 2 , ▁the ▁term ▁tri o ▁el étr ico ▁had ▁become ▁generic , ▁in ▁reference ▁to ▁a ▁tr uck ▁or ▁bus ▁carrying ▁mus icians ▁around ▁during ▁Bah ian ▁car n ival . ▁In ▁ 1 9 6 9 , ▁Ca et ano ▁Vel oso ' s ▁song ▁" A tr ás ▁do ▁tri o - el étr ico " ▁( Be hind ▁the ▁tri o - el étr ico ) ▁popular ized ▁the ▁T rio ▁El étr ico ▁sound ▁nation wide . ▁Today , ▁the ▁presence ▁of ▁T rio ▁El étr ico ▁tr uck s ▁is ▁one ▁of ▁the ▁main ▁attra ctions ▁of ▁the ▁Car nav al ▁da ▁Bah ia . ▁ ▁Organ ization ▁ ▁Pre ced ing ▁events ▁and ▁official ▁opening ▁ ▁Starting ▁from ▁the ▁new ▁year ' s ▁e ve , ▁several ▁events ▁lo os ely ▁related ▁to ▁the ▁car n ival ▁happen ▁in ▁Salvador . ▁The ▁most ▁traditional ▁is ▁" L av agem ▁da ▁Esc ad aria ▁do ▁Bon f im "