We report measurements made at LCLS of average and single shot spectra of x-ray FEL radiation, including correlations with chirp and bunch current. And, for normaland over-compressed beams, we show the relationship between the electron energy distributions before the undula-tor and FEL spectra. We find the bandwidth of normally compressed beams can approach the theoretical minimum SASE bandwidth, though only for relative weak beams. Over-compressed beams can have large bandwidth with fwhm of 2% or more and pulse energy comparable to normally compressed beams. In this case the bandwidth is dominated by electron energy spread and the FEL radiation is probably chirped.