  Superconductivity is an important area of modern research which has benefited
enormously from experiments under high pressure conditions. The focus of this
paper will be on three classes of high-temperature superconductors: (1) the new
binary compound MgB2, (2) the alkali-doped fullerenes, and (3) the cuprate
oxides. We will discuss results from experiment and theory which illustrate the
kinds of vital information the high-pressure variable can give to help better
understand these fascinating materials.
