Rosenblum was the musical director of the
Israel Defense Forces chorus during the 1960s and 1970s. He directed Israel’s annual music festivals in
Arad and oversaw conducting and composition for the
Israeli military ensembles. He composed several well-known songs, including
Shir LaShalom (1969). He composed music for films and television and worked with various bands and choral groups, primarily the military ensembles. Over his career, Rosenblum wrote more than 1,000 songs, including
Ammunition Hill,
In a Red Dress,
The Beautiful Life,
Tranquility,
Hallelujah,
How Should I Bless Him?, and
We Must Keep On Singing. In addition to composing for military ensembles such as Lehakat HaNahal, he wrote music for a number of Israeli performers, including Ilanit,
Ofra Haza,
Rivka Michaeli,
Yossi Banai, and
HaGashash HaHiver. ==Death and commemoration==