In a tour-de-force experiment in 1980, Klein and Sooryakumar discovered a collective mode in the superconducting phase of NbSe in a Raman experiment. This mode interacts with the collective mode of the charge density wave and was interpreted a few year later by Littlewood and Varma to be a Higgs amplitude mode of the superconducting state.
Could it really be said that the Higgs mode was discovered in Urbana in 1980?
Of course, I am being facetious, but it is a rather cute historical curiosity. That being said, I have to also admit that I am not 100% convinced that this interpretation is correct, though it does carry some weight.
The other part of this experiment that makes it particularly relevant to current studies is the observation of an interaction between superconductivity and charge density waves as was mentioned in a previous post. With the application of a magnetic field, they were able to suppress the superconductivity and enhance the charge density wave collective excitation as pictured below.