▁technology ▁One ▁important ▁goal ▁of ▁the ▁Ex position ▁was ▁to ▁present ▁the ▁latest ▁in ▁science ▁and ▁technology . ▁Thomas ▁Ed ison ▁visited ▁the ▁Ex position ▁to ▁visit ▁a ▁pav il ion ▁devoted ▁to ▁his ▁recent ▁invent ions , ▁including ▁an ▁improved ▁ph on ograph ▁clearer ▁better ▁sound ▁quality . ▁There ▁were ▁pav il ions ▁especially ▁devoted ▁to ▁the ▁tele phone ▁and ▁to ▁electric ity , ▁and ▁others ▁devoted ▁to ▁mar itime ▁navigation ▁and ▁to ▁military ▁technology . ▁ ▁Music ▁and ▁Entertainment ▁ ▁The ▁Ex position ▁itself ▁included ▁several ▁large ▁the at res ▁for ▁concert s ▁and ▁spect acles , ▁including ▁one ▁for ▁the ▁d anc ers ▁of ▁Les ▁Fol lies ▁Paris iens . ▁▁ ▁A ▁ ▁separate ▁theatre ▁presented ▁the ▁music ▁and ▁dance ▁of ▁the ▁French ▁colon ies ▁in ▁Ind och ina . ▁Oper as ▁and ▁concert s ▁were ▁also ▁given ▁in ▁the ▁grand ▁hall ▁of ▁the ▁Tro c ad ero ▁Palace . ▁▁▁ ▁The ▁Op éra ▁Com ique ▁premier ed ▁on ▁ 1 4 ▁May ▁ 1 8 8 9 ▁with ▁a ▁work ▁spe cially ▁composed ▁for ▁that ▁event : ▁Jules ▁Mass en et ' s ▁Es cl arm onde ▁( de but ing ▁American ▁sop rano ▁Sy bil ▁Sand erson ). ▁▁ ▁The ▁Bar num ▁and ▁Ba iley ▁Circ us ▁performed ▁during ▁the ▁Ex position ▁in ▁the ▁S alle ▁des ▁F etes ▁of ▁the ▁Pal ais ▁des ▁Mach ines . ▁▁ ▁At ▁the ▁Ex position , ▁the ▁French ▁composer ▁Claude ▁Deb uss y ▁first ▁heard ▁J avan ese ▁gam el an