  In these proceedings we study various sources of theoretical uncertainty in
the Drell-Yan $p_T^{{\ell\ell}}$ spectrum focussing on the $p_T^{{\ell\ell}}
\lesssim 100\, {\rm GeV}$ region. We consider several perturbative aspects
related to the choice of the scale setting adopted in resummed calculations,
and we assess their impact on the theoretical prediction both for the
differential $p_T^{{\ell\ell}}$ spectrum and for the $\rm{N}^3\rm{LO}$ fiducial
cross section. For both quantities, we find the results obtained with the
different setups to be compatible with each other within the quoted
uncertainty, highlighting the robustness of the theoretical prediction. In all
cases, the experimental LHC data for the $p_T^{{\ell\ell}}$ spectrum is well
described by our calculation.
