What this puzzle is, orthographically - Answers with 16 Letters

Question:

What this puzzle is, orthographically

Answer:

QUADRUPLEPANGRAM

Length:

Similar Crossword Questions:

This puzzle's theme, whose first notes are indicated by shaded squares
Container that holds two generous glasses of wine (as well as a double dose of this puzzle's theme?)
Quadrennial occasion celebrated by this puzzle's theme entries
Direction of some puzzle words
Its common extensions are the theme of this puzzle
Title on certain language videos ... with a hint to entering six answers in this puzzle
Season during which this puzzle is appropriate?
Right now, as hidden in this puzzle's longest answers
Brit's puzzle pieces
Noted box opener (that, curiously, will tell you what to put in six of this puzzle's boxes when read with the enumeration 1 3/2 1)
Word form made with the big letter depicted in this puzzle's diagram (this letter is entirely absent from the solution)
Title of the puzzle
90...or a good title for this puzzle?
Puzzle's hidden theme
Narcissists' interests (one of which can be found in each of the puzzle's longest answers)
March figure ... or, when split into three parts, a title for this puzzle
Goodies unclaimed as a result of this puzzle's predicament
1960 hit song, and this puzzle's title
"___ is completely over" (baffling statement made by Prince on 7/5/10 that also serves as a clue how to find four answers in this puzzle)
How most reading is done, and this puzzle's title
Catalog name, or a possible title for this puzzle
Put more pressure (on) ... or a title for this puzzle?
Cartoon puzzle of newspapers
Workweek start, or an apt title for this puzzle based on an abbreviation found in its five longest answers
Alternative words used as alternatives for each other in this puzzle's theme answers