Let's REDEFINE this one, shall we? The accepted English
defintion is: "A structure, configuration, or pattern of physical, biological, or psychological phenomena so integrated as to constitute a functional unit with properties not derivable by summation of its parts". This is adequate, however, let's also define the word historically as well. It is really a German word, literally
meaning "form", defined as an organized whole in experience. The Gestalt psychologists, in about 1912, advanced the theory which explains psychological phenomena by their relationships to total forms rather than their parts. Also, this word has become useful for discussing musical terms (or a critique on music, rather) in the post-modern sense. It is the "essence", or "foreground" of any given band (or genre) in discussion.
"T. Rex surpassed it's place in the 1970's Glam Rock Movement with a cross-pollination of different
while having an influence on pop music
today that has endured far beyond bands who had more than seven chords in their entire respective repertoire(s)."