▁She ▁gave ▁concert s ▁before ▁various ▁world ▁leaders : ▁ ▁President ▁Charles ▁de ▁Ga ulle ▁of ▁France , ▁the ▁leader ▁of ▁Y ug oslav ia ▁Jos ip ▁Bro z ▁T ito , ▁Soviet ▁minister ▁And rei ▁G rom y ko , ▁Premier ▁of ▁the ▁Soviet ▁Union ▁Leon id ▁Bre zh ne v , ▁King ▁of ▁Spain ▁Juan ▁Carlos ▁I ▁and ▁Queen ▁Sof ia , ▁Queen ▁Elizabeth ▁II , ▁American ▁Pres idents ▁D w ight ▁D . ▁Eisen h ower , ▁John ▁F . ▁Kennedy , ▁Ly nd on ▁B . ▁Johnson ▁and ▁Richard ▁N ixon ▁and ▁ ▁Pres idents ▁of ▁Mexico ▁Ad ol fo ▁Ru iz ▁Cort ines ▁and ▁Carlos ▁Sal inas ▁de ▁G ort ari . ▁▁▁ ▁She ▁was ▁the ▁first ▁ran ch era ▁singer ▁to ▁perform ▁at ▁the ▁Pala cio ▁de ▁Bell as ▁Ar tes ▁( Pal ace ▁of ▁Fine ▁Arts ), ▁the ▁premier ▁opera ▁house ▁and ▁concert ▁hall ▁in ▁Mexico . ▁She ▁also ▁sang ▁in ▁the ▁Olymp ia ▁Music ▁Hall ▁in ▁Paris , ▁the ▁T cha ik ov sky ▁Hall ▁in ▁Moscow ▁and ▁the ▁Conserv atory ▁of ▁L ening rad ▁( now ▁Saint ▁Petersburg ) ▁in ▁the ▁former ▁Soviet ▁Union . ▁ ▁Bel tr án ▁was ▁hon ored ▁in ▁ 1 9 9 5 ▁with ▁her ▁inclusion ▁into ▁a ▁series ▁of ▁comm emor ative ▁post age ▁st amps , ▁issued ▁by ▁her ▁native ▁Mexico , ▁hon oring ▁ ▁' Pop ular ▁Id ols ▁of ▁Radio '. ▁ ▁This ▁was ▁done ▁in ▁recognition ▁of ▁her ▁lifetime ▁achiev ement ▁in ▁the ▁real