▁lyr ics . ▁The ▁group ▁sang ▁this ▁song ▁to ▁Ál vare z , ▁who ▁became ▁convinced ▁that ▁he ▁had ▁to ▁be ▁their ▁producer . ▁The ▁song ▁is ▁a ▁form ▁of ▁bl ues , ▁with ▁a ▁resolution ▁that ▁subst it utes ▁the ▁dominant ▁ch ord ▁for ▁a ▁cad ence ▁that ▁desc ends ▁towards ▁the ▁t onic ▁( ch ords ▁b III ▁/ ▁II - 7 ▁/ ▁I ), ▁and ▁a ▁c oda ▁that ▁is ▁repeated ▁at ▁the ▁end ▁of ▁each ▁verse ▁( ch ords ▁I ▁/ ▁II - 7 ). ▁The ▁harm ony ▁and ▁arrangement ▁are ▁similar ▁to ▁jazz . ▁Ser gio ▁P uj ol ▁comments ▁in ▁his ▁book ▁Can ciones ▁Argent inas : ▁" The ▁mel ody ▁of ▁' Av ellan eda ▁Blues ' ▁pract ically ▁does ▁not ▁exist , ▁it ▁is ▁just ▁a ▁musical ▁channel ▁conce ived ▁by ▁Mart ine z ▁while ▁reading ▁al oud ▁its ▁own ▁letter ." ▁ ▁Rec ording ▁ ▁Like ▁the ▁other ▁songs ▁on ▁Man al , ▁" Av ellan eda ▁Blues " ▁was ▁recorded ▁in ▁ 1 9 7 0 ▁at ▁T NT ▁Studios . ▁The ▁recording ▁techn ician ▁was ▁Tim ▁Cro atto , ▁former ▁member ▁of ▁The ▁T NT . ▁The ▁mus icians ▁were ▁J avier ▁Martínez ▁on ▁drums ▁and ▁vocal , ▁Claud ius ▁Gab is ▁on ▁electric ▁guitar ▁and ▁piano , ▁and ▁Ale j andro ▁Med ina ▁on ▁electric ▁bass . ▁Jorge ▁Ál vare z ▁and ▁Pedro ▁Pu jo ▁were ▁the ▁produ cers , ▁with ▁Salvador ▁and ▁Tim ▁Cro atto ▁as ▁the ▁recording ▁techn icians