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In this paper we study the evolutive problem of linear viscoelasticity with a singular kernel memory $G^{\prime }$. We assume that $G^{\prime }$ presents an initial singularity, so that it is not a $L^1$-function in time, whereas the relaxation function $G$ is integrable at $t=0$. By applying the Fourier transform method, we prove a theorem of existence and uniqueness of the weak solutions in a functional space whose definition is strictly related to the properties of the kernel memory.