[MUSIC PLAYING]
ONE DIRECTION: This letter's "U."
You know it's true.
It starts some words.
There are more than a few-ew-ew.
LOUIS: U starts uh, and ugh and up.
U starts udon.
There's some in this cu-u-up.
HARRY: 26 letters are in the alphabet.
But we're here to sing about U.
ONE DIRECTION: U, you begin the word ukelele.
U, there's a UFO flying by me.
U, and you're gonna feel so unhappy.
I love U, ooh-ooh.
U, you know so you're useful.
U, for unique.
That's a unique gown.
U, check it out, Elmo's upside-down.
U, there's a unicorn dressed as a clown.
Letter U-u-u.
That's what makes you so useful.
Ooh-ooh.
HARRY: That's what makes you so useful.
ZAYN: Don't get upset.
U's what you get.
And when you swim underwater, you're we-e-et.
NIALL: U starts urn.
That's what I've learned.
And a unicycle taught to t-uh-urn.
HARRY: 26 letters are in the alphabet.
But we're here to sing about U.
ONE DIRECTION: U, for utensils in Grover's hands.
U is for uncles, but not for aunts.
U, there are U's on those underpants.
Letter U-u-u-- that's what makes you so useful.
Ah-ah-ah.
[CONTINUES_]
U, you're the ultimate.
Come take a bow.
U, there are artists under that cow.
U, check it out.
It's Bert's unibrow.
Starts with U-u-u.
U, you know you're so useful.
Ooh-ooh.
That's what makes you so useful.
Ooh-ooh.
HARRY: That what makes U so useful.
SINGER IN VIDEO: [SINGING], You sing a song,
and you be a great dancer.
You dunk a ball, and you make the right letter.
Everything you do, you do it better.
This is what you get.
'Cause this is what you get. 'Cause
this is what you get-- with the power of yet.