▁the ▁effort ▁made ▁in ▁exp elling ▁some ▁obst ruction ▁from ▁the ▁thro at ... ▁The ▁gl ott is ▁is ▁prepared ▁for ▁art ic ulation ▁by ▁closing ▁it , ▁which ▁causes ▁a ▁moment ary ▁accum ulation ▁of ▁air ▁below ; ▁and ▁it ▁is ▁then ▁opened ▁by ▁a ▁sudden ▁and ▁vig orous ▁stroke , ▁similar ▁to ▁the ▁action ▁of ▁the ▁lips ▁when ▁strongly ▁emphas ising ▁the ▁letter ▁P . ▁Some ▁master s ▁recommend ▁the ▁use ▁of ▁[ con son ants , ▁e . g . ▁Pa , ▁La ] ▁in ▁order ▁to ▁ac quire ▁precision ▁in ▁striking ▁notes ; ▁but ▁in ▁our ▁opinion ▁this ▁plan ... ▁has ▁the ▁dis adv antage ▁of ▁merely ▁dis gu ising ▁the ▁fault y ▁art ic ulation ▁of ▁the ▁gl ott is , ▁without ▁possess ing ▁any ▁power ▁whatever ▁of ▁correct ing ▁it .' ▁Gar cia , ▁A ▁Comp end ious ▁Tre at ise , ▁Part ▁ 1 ▁Chap . ▁ 6 , ▁section ▁on ▁Art ic ulation ▁of ▁the ▁Gl ott is . ▁ ▁Crit ic ism ▁ ▁Much ▁of ▁Gar cia ' s ▁' method ' ▁remains ▁extremely ▁important ▁as ▁a ▁plan ▁for ▁the ▁correct ▁development ▁and ▁production ▁of ▁the ▁voice . ▁But ▁in ▁this ▁respect ▁his ▁' s cient ific ' ▁approach ▁mis f ired , ▁and ▁resulted ▁in ▁many ▁students ▁and ▁sing ers ▁attempting ▁to ▁reproduce ▁the ▁effect ▁described ▁by ▁conscious ▁mus cular ▁movement ▁in ▁the ▁thro at . ▁This ▁often ▁had ▁inj ur ious ▁results . ▁An ▁essential ▁basis ▁of ▁express ive ▁singing ▁is ▁that