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PLANAR free shear or mixing layers have received tremendous attention over the past several decades, because these canonical flows are the building blocks in many practical applications. The discovery of large-scale coherent structures in high Reynolds number free shearflows by Brown and Roshko [1] and the realization that these structures play a major role in entrainment and bulk mixing [2] and in far-field radiated noise production [3] has changed the nature of the research over the past three decades by putting more focus on the dynamics and control of these structures. A review article by Ho and Huerre [4] details most of the early work on the physics of low-speed free shear flows, as well as their control, over about two decades. A review article by Tam [5] details the work in jet noise and the role of large-scale structures.