Iroha

Even the blooming flowers
Will eventually fade.
Even our world
Is not eternal.
The deep mountains of vanity-
Cross them today,
And superficial dreams
Shall no longer delude you.

Significance: This is the English translation of a Japanese syllabary pangram called the Iroha. It contains all the morae found in Japanese. It's similar to the English pangram "The quick brown fox jumps over the lazy dog." -- with one major difference: the Iroha is more efficient. It uses every kana only once, except one. The famous English pangram has 35 letters- 9 more than necessary to include all our letters.

Still, just as the ABC song is used for teaching the alphabet instead of the above English pangram, the Gojuon is used more than the Iroha.

It's probably just as well that we don't use "The quick brown fox jumps over the lazy dog." to teach our alphabet. Nevermind the ordering- that's only an excuse because it's what we're used to. The ABC song just makes learning about some arbitrary alphabetizing easier because of the lack of redundancy.

I suppose that's why the Gojuon is used more than the Iroha. Nevertheless, that shows an amazingly lower tolerance for redundancy than us. Consider this: there are other English pangrams but the above one is by far the most popular, probably due in part to its use of imagery. BUT what if another pangram were more popular, just as pronouncable, equally or more vivid, made just as much sense, and only repeated one letter? Wouldn't it be impossibly tempting to use that instead of the ABC song?
I think so. (At least then, "Twinkle Twinkle Little Star" wouldn't have to share its elegant melody.)

Note also that the Gojuon lists the morae in a phonetic order. Wouldn't it be great if our alphabet were so organized, possibly taking care of the ever-awkward "ellemminno" problem, like so:
AHJKRBCDEGPTVZFLMNSXIYOQUW
or if we want to keep a-z:
AHJKRFLMNSXIYOQUWBCDEGPTVZ

I can dream, can't I? Who knows- maybe one day people will look back at now and laugh at the stupid English teachers teaching the silly ABCs instead of the AHJs