Mu mujyi wa Halberstadt mu Budage, mu rusengero rwa kera rwa St. Burchardi, hari igihangano cy'umuziki cyitwa "Organ²/ASLSP (As Slow As Possible)", cyahimbwe n'umuhanga mu muziki w'Umunyamerika witwa John Cage.
John Cage yahimbye iki gihangano mu 1987, ariko ntiyigeze agaragaza igihe nyacyo kigomba kumara. Yatanze amabwiriza yoroshye gusa agira ati: "Gicurangwe buhoro bishoboka."
Nyuma y'urupfu rwe, itsinda ry'abahanga mu muziki n'abafilozofe bo mu Budage ryafashe icyemezo cyo kugerageza gukurikiza ayo mabwiriza mu buryo bukabije. Ni bwo havutse igitekerezo cyo kugicuranga mu gihe cy'imyaka 639.
Kuki imyaka 639?
Abateguye uwo mushinga bifashishije amateka y'umuziki wo mu mujyi wa Halberstadt. Basanze mu mwaka wa 1361 ari bwo hashyizwe imwe mu nanga za mbere zifite imiterere ya kijyambere muri uwo mujyi.
Bafashe umwaka wa 2000, bakuramo 1361, babona imyaka 639. Bahitamo ko icyo gihangano kizacurangwa muri icyo gihe cyose kugira ngo hubahirizwe amateka y'uwo mujyi.
Igitaramo cyatangiye ku wa 5 Nzeri 2001. Igitangaje ni uko mu myaka hafi ibiri ya mbere nta jwi na rimwe ryigeze ryumvikana, kuko igihangano cyatangiranye n'ituze ryuzuye. Ijwi rya mbere ryumvikanye ku wa 5 Gashyantare 2003.
Kuva icyo gihe, inanga ikomeje gucuranga amajwi amwe mu gihe kirekire cyane mbere yo guhindura inota cyangwa chord. Kimwe mu bintu bitangaje cyane ni uko rimwe na rimwe amajwi amwe ashobora kumara imyaka ibiri cyangwa irenga atarahinduka.
Mu mwaka wa 2024, abantu babarirwa mu magana baturutse mu bihugu bitandukanye bagiye muri urwo rusengero kureba ihinduka rya chord ryabaye nyuma y'imyaka ibiri nta gihindutse. Iryo hinduka ryabaye inkuru mu bitangazamakuru byinshi ku Isi. Iryakurikiyeho ryari riteganyijwe mu 2026.
Iki gihangano si indirimbo icurangwa buri munsi, ahubwo ni umushinga wateguwe mu byiciro birebire cyane. Inanga yo mu rusengero rwa Halberstadt icurangwa hifashishijwe umuyaga uturuka ku mashini (bellows), mu gihe abantu baza rimwe na rimwe gusa bagahindura amajwi cyangwa chord hashingiwe ku ngengabihe yateguwe imyaka myinshi mbere.
Ibi byose byateguwe mbere, bikandikwa nk'amabwiriza azakomeza gukurikizwa n'ibisekuru bizaza. Umwaka wa 2640 nugera, impinduka ya nyuma izakorwa nk'uko byari byarateganyijwe, maze igihangano kirangire, atari uko kizaba gihagaze, ahubwo kuko gahunda yacyo izaba yararangiye.
Kimwe mu bintu bikora ku mutima ni uko nta n'umwe mu bantu batangije uyu mushinga uzaba akiriho igihe uzarangirira. Abawuteguye bavuga ko intego atari ukureba iherezo ryawo, ahubwo ari ukwibutsa abantu ko hari ibikorwa bishobora kurenza ubuzima bw'umuntu umwe kandi bikabaho ku bw'ibisekuru byinshi bizaza.
Mu gihe indirimbo nyinshi zimara iminota mike cyangwa amasaha make, igihangano cya John Cage cyo cyahinduye uburyo abantu batekereza ku muziki n'igihe. Cyatangiye mu 2001, kiracyakomeza no muri iki gihe, kandi kizakomeza gucurangwa kugeza mu mwaka wa 2640. Ni kimwe mu bihangano bidasanzwe kandi bitangaje byigeze bikorwa mu mateka y'umuco n'umuziki ku Isi.