Like a Virgin (1984)
Madonna's breakthrough album, with the all-to-familiar "Material Girl" and title track, Like a Virgin won't win many critical hearts, but this is where the Madonna craze truly began.
Like a Prayer (1989)
Hailed as Madonna's most mature album at the time, Like a Prayer is distinctly confessional, largely danceable, and it's final track, "Act of Contrition" adds a little "Revolution Number 9" flavor into the mix.