▁sole á ▁is ▁considered ▁to ▁be ▁relatively ▁new ▁compared ▁to ▁Ton ás ▁and ▁Seg ui ri y as . ▁The ▁earliest ▁known ▁mention ▁of ▁them , ▁referred ▁to ▁as ▁" so led ades ", ▁is ▁that ▁of ▁Spanish ▁poet ▁Gustav o ▁Ad ol fo ▁B éc quer , ▁in ▁ 1 8 6 2 . ▁The ▁existence ▁of ▁them ▁prior ▁to ▁ 1 8 5 0 ▁is ▁often ▁stated , ▁but ▁has ▁never ▁been ▁proved . ▁Fol k lor ist ▁Dem ó fil o ▁assured , ▁as ▁early ▁as ▁ 1 8 7 9 , ▁that ▁they ▁derived ▁from ▁the ▁" cop las ▁de ▁j ale o ", ▁a ▁kind ▁fest ive ▁song ▁style ▁in ▁a ▁very ▁l ively ▁rh ythm , ▁apparently ▁very ▁popular ▁in ▁the ▁mid ▁ 1 9 th ▁century . ▁These ▁facts ▁contradict ▁other ▁views ▁according ▁to ▁which ▁the ▁sole á ▁would ▁be ▁the ▁origin ▁of ▁the ▁rest ▁of ▁fl amen co ▁" pal os " ▁and ▁was ▁from ▁the ▁beginning ▁a ▁serious ▁and ▁solemn ▁style . ▁In ▁their ▁primitive ▁stages , ▁sol é a , ▁as ▁well ▁as ▁j ale o , ▁seem ▁to ▁have ▁been ▁linked ▁to ▁Gy ps y ▁environments ▁in ▁several ▁towns ▁of ▁the ▁provinces ▁of ▁C ád iz ▁and ▁Se ville . ▁ ▁The ▁golden ▁age ▁of ▁the ▁sole á ▁is ▁considered ▁to ▁be ▁the ▁last ▁quarter ▁of ▁the ▁ 1 9 th ▁century , ▁at ▁the ▁time ▁when ▁the ▁" ca f é ▁cantante " ▁( mus ical ▁c afé ) ▁was ▁the