  In this paper we investigate the shear viscoelasticity and the hydrodynamic
modes in a holographic solid model with several sets of axions that all break
the translations spontaneously on boundary. Comparing with the single-axion
model, the shear modulus is enhanced at high temperatures and the shear
viscosity is always suppressed in the presence of additional axions. However,
the different sets of axions exhibit competitive relationship in determining
the shear modulus at low temperatures. Furthermore, by calculating the black
hole quasi-normal modes, it is found that adding more axions only increases the
amount of diffusive modes. The number of the sound modes always remains
unchanged.
