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MCG-6-30-15, at a distance of 37 Mpc (z=0.008), is the archetypical Seyfert 1galaxy showing very broad Fe K$\alpha$ emission. We present results from ajoint NuSTAR and XMM-Newton observational campaign that, for the first time,allows a sensitive, time-resolved spectral analysis from 0.35 keV up to 80 keV.The strong variability of the source is best explained in terms of intrinsicX-ray flux variations and in the context of the light bending model: theprimary, variable emission is reprocessed by the accretion disk, which producessecondary, less variable, reflected emission. The broad Fe K$\alpha$ profileis, as usual for this source, well explained by relativistic effects occurringin the innermost regions of the accretion disk around a rapidly rotating blackhole. We also discuss the alternative model in which the broadening of the FeK$\alpha$ is due to the complex nature of the circumnuclear absorbingstructure. Even if this model cannot be ruled out, it is disfavored onstatistical grounds. We also detected an occultation event likely caused by BLRclouds crossing the line of sight.

The broad band spectral variability of MCG-6-30-15 observed by NuSTAR and XMM-Newton