CLEO results on vertical bar Vcb vertical bar and vertical bar Vub vertical bar

I report results from the CLEO collaboration on semileptonic B decays, highlighting measurements of the Cabibbo-Kobayashi-Maskawa matrix elements vertical bar Vcb vertical bar and vertical bar Vub vertical bar. I describe the techniques used to obtain the recent improvements in precision for these measurements, including the use of the b → sγ photon spectrum to reduce hadronic uncertainties in semileptonic B decays