  Differential cross sections of charged particles in inelastic pp collisions
as a function of $p_{\rm T}$ have been measured at $\sqrt{s}=$ 0.9, 2.76 and 7
TeV at the LHC. The $p_{\rm T}$ spectra are compared to NLO-pQCD calculations.
Though the differential cross section for an individual $\sqrt{s}$ cannot be
described by NLO-pQCD, the relative increase of cross section with $\sqrt{s}$
is in agreement with NLO-pQCD. Based on these measurements and observations,
procedures are discussed to construct pp reference spectra at $\sqrt{s} =$ 2.76
and 5.02 TeV up to $p_{\rm T}$ = 50 GeV/$c$ as required for the calculation of
the nuclear modification factor in nucleus-nucleus and proton-nucleus
collisions.
