Howard Gardner proposed the Multiple Intelligences Theory in 1983. The basis of this theory is that the one's intelligence is not solely based on one specific area of ability, but is instead an accumulation of different areas of intelligence that gives all of us our own distinct knowledge and abilities. Gardner hypothesized that there is a huge range of different cognitive abilities, but that none of these abilities show a very good correlation to one another, which has been almost disproven by other researchers.
I do believe that Howard Gardner was right in believing that there is a wide variety of different things that make up each of our own, individual thought processes. Some of us are more knowledgeable in creative things like music or painting, while others are better at mathematics and science. It's just the way that our minds are built.