We have measured the Raman scattering from three single crystals of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathit{x}}$ at high, x\ensuremath{\rightarrow}0, intermediate, x\ensuremath{\approxeq}0.5, and low doping level, x\ensuremath{\approxeq}0.15. Both fully symmetrical diagonal and off-diagonal phonons without any disorder induced modes have been identified for x\ensuremath{\rightarrow}0, whereas only diagonal scattering showed substantial strength in the other two crystals. The high frequency of the apical oxygen phonon, reaching 517 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ at room temperature for x\ensuremath{\rightarrow}0, has been found to be a hallmark of the crystals grown by a pulling technique.