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We discuss mixed inflaton and spectator field models where both the fieldsare responsible for the observed density fluctuations. We use the current CMBdata to constrain both the general mixed model as well as some specificrepresentative scenarios, and collate the results with the model predictionsfor the CMB spectral $\mu$ distortion. We find the posterior distribution of$\mu$ using MCMC chains and demonstrate that the standard single-field inflatonmodel typically predicts $\mu \sim 10^{-8}$ with a relatively narrowdistribution, whereas for the mixed models, the distribution turns out to bemuch broader, and $\mu$ could be larger by almost an order of magnitude. Hencefuture experiments of $\mu$ distortion could provide a tool for the criticaltesting of the mixed source models of the primordial perturbation.

Mixed Inflaton and Spectator Field Models: CMB constraints and $\mu$ distortion