While the double album (two vinyl LPs) has long been the medium for big-thinking artists from Bob Dylan to Pink Floyd, introducing cassettes and compact discs in the 1980s changed the format length and what actually qualified as a double album. In the 1990s, artists again began pushing the limits of the dominant medium, as evidenced by double album releases over two compact discs not only by 90s rock bands like The Smashing Pumpkins or Wilco, but with hip-hop, electronic and others expanding their releases like from The Notorious B.I.G., Nine Inch Nails, The Orb, Tupac Shakur, and others.