Mezue ahịrịokwu na-esonụ:
Ndị agha mba Czechoslovakia wakporo Czechoslovakia na 20 August 1968, agụmakwụkwọ Hammer na Academy kwụsịrị. Hammer dekọtara egwu egwu jazz trio na "The Domicile" na Munich na 30 August 1968. E wepụtara nke a dị ka Maliny Maliny site na German label MPS Records. Hammer kpebiri ịkwaga United States ma kpebie ịghọ nwa amaala mgbe ọ natara agụmakwụkwọ na Berklee School of Music na Boston.