Lyrics:

Yakko: Level and levity, lewd and longevity
Libel, libation, Lanai
Lithium, litigate, legal, legitimate
Liberty, levy and lie

Dot : Welcome back. Yakko's now at the L's as he tries to sing all
The words in the English language. A slight mistake at the
F's -- here's what it looked like:

Yakko: Facial and faction and fractal and fraction
And fraudulent, fragrant, frappé
Frankincense, frankiship frankenshhhh
Shoot! Yadda yadda flambé!

Yakko: Libation and libertine, limited, limousine
Limpid and limbo
Dick : Now, that mistake (and lime)
could have proved costly for Yakko (Lima and lipid and literature, liquid)
but he recovered beautifully (And listing and liter and line)
Dot : Now let's watch as Yakko continues with the L's

There's lobby and loading and loathsome and loaning
And logo and then locomotion
There's lotus and lottery, lobo, lobotomy
Logic and loosen and lotion

Dot : Yakko's now about halfway through all the words in the English
Language. Dick Button and I will be back with more

Lozenge and lubber and lucky and lover
And lullaby, lumber and luke
Luster and luscious and lunatic, lustrous
And lurking and lunar and lute