Dee ihe ga-eso paragraf a - Mgbe Warsaw Pact wakporo
Czechoslovakia na 20 Ọgọstụ 1968, a kwụsịrị ọmụmụ ihe Hammer na Academy. 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.