Boris Thomashefsky writes in his "Theater shriftn", that R. said in the cigarette factory [where Thomashefsky had worked], that he was an actor in the home. Later he revealed that he was a stand-in in "Koldonye" and with "Dybbuk" in the "Marinski" theatre in Odessa.

Rozenblum used to singing pieces from the Yiddish theatre in the factory, such as "Bobklekh", "Vos toyg mir meyn simkha, az men nemt zi nit", "Bristlekh lebedike, lebedike bristlekh", "Oy vey, dlus" et al. The last song for every cigarette maker was dos libste. Everyone had sung it in the chorus.

Thomashefsky further recalls:

"Rozenblum with the large nose had begun to study with the workers in the first chorus of "Shulamis", "Ongeladn mit ales guts, mit di shtekelekh in di hent", this means the singing must be with the shtekenes in his hands, only the cigarette makers have created the texts of "Di shtekelekh in the hent", because all cigarette makers keep iron shtekelekh antsushupn with them the tobacco in the gilzn areyn".

• "Thomashefsky's theater shriftn", New York, 1908.