What alternative rock band, Madrugada or Helium, released two full-length albums in 5 years? 
Madrugada (band):  On 21 January 2008, the band released "Madrugada" and announced that they would split after one last tour. Helium (band):  Between 1992 and 1997, they released two full-length albums, three EPs and several singles.
i don't know