Speakerboxxx/The Love Below — OutKast

OutKast's 2003 double album stands as a towering achievement in hip-hop and pop, winning the Grammy for Album of the Year 2004 and surpassing even the sales of #6 Funeral by over 4.5 million copies in the US alone, with 5.5 million sold. It spawned the #1 single 'Hey Ya!', which dominated the Billboard Hot 100 for 9 consecutive weeks, and sold over 11 million copies worldwide, making it the group's most commercially successful release.