While blind challenges have become popular in different chemical subcommunities such as protein and crystal structure prediction or physicochemical data for drug molecules in solution , we are not aware of a blind challenge explicitly addressing vibrational spectroscopy data as a rigorous connecting point between theory and experiment. This may also be due to the fact that this connection relies on challenging electronic structure and vibrational anharmonicity issues at the same time. However, this is also subtly true for observables like molecular structure and energy differences , and therefore it appears timely to investigate a more bold case.