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String theory models generically predict the existence of multiple axion-like particle (ALP) fields, yet the majority of both theoretical and experimental works have assumed only one ALP. In this talk, I will discuss the phenomenology of systems with multiple ALPs that can undergo oscillations akin to neutrino oscillations. Motivated by this effect, we have extended the ‘anarchy’ framework, which has been used to predict neutrino oscillation parameters, to generate the parameters of many ALP systems. We have explored the phenomenology of these ALP anarchy models in some of the leading ALP search strategies, including the CERN Axion Solar Telescope, magnetic white dwarfs and the gamma-ray spectra of distant blazars. ALP anarchy models predict drastically different results than single ALP models.