Nonlinear spectroscopies are exceptionally powerful tools that can elucidate complex structure and dynamics in chemical systems. In these techniques, multiple short coherent light pulses interact with matter to generate a higher order polarization response . While linear spectroscopy has been effectively employed to provide energetic and structural information, the remarkable versatility of nonlinear methods originates from experimental control over the frequency, intensity, beam geometry, and sequence of each of the incoming pulses. These additional degrees of freedom allow for highly selective measurements in both the frequency and time domains, permitting diverse applications such as probing structure and dynamics in complex chemical systems , disentangling homogenous and inhomogeneous line widths, and modifying the spectral bandwidth of light sources . The extension of nonlinear spectroscopies into the extreme ultraviolet (XUV) and x-ray spectral regions will enable experiments that investigate short-lived and element-specific inner-valence and core-excited states with greater spatial and temporal resolution , further expanding the frontiers of these important techniques.