Over the past years, there has been growing evidence that the brain entrains to rhythms in the environment and that this entrainment facilitates sensory processing and attentional selection. However, rhythmic stimuli also produce rhythmic evoked responses in sensory cortices, posing a challenge for demonstrating “purely endogenous” neural entrainment. In this talk I will survey several recent MEG and EEG studies in which we attempt to disentangle bottom-up auditory evoked responses from evidence of neural entrainment to simple tones as well as complex stimuli such as speech and music.