A poem by John Milton, first published in 1645. L'Allegro, 'Allegro' meaning lively, gay, or merry, in Italian, is thought to be the companion piece and counterpart to Il Penseroso; The former is of a happy, almost carefree attitude, spent in sunny days and festive nights, whereas the latter is far more thoughtful and somber.

See the bolded lines below for what could be the origin of the term "tripping the light fantastic." And, no, those aren't spelling errors down there; that's just the poetic English of 350 years ago.

L'Allegro

Hence loathed Melancholy
Of Cerberus, and blackest midnight born,
In Stygian Cave forlorn.
'Mongst horrid shapes, and shreiks, and sights unholy,
Find out some uncouth cell,
Where brooding darkness spreads his jealous wings,
And the night-Raven sings;
There under Ebon shades, and low-brow'd Rocks,
As ragged as thy Locks,
In dark Cimmerian desert ever dwell.
But com thou Goddess fair and free,
In Heav'n ycleap'd Euphrosyne,
And by men, heart-easing Mirth,
Whom lovely Venus at a birth
With two sister Graces more
To Ivy-crowned Bacchus bore;
Or whether (as som Sager sing)
The frolick Wind that breathes the Spring,
Zephir with Aurora playing,
As he met her once a Maying,
There on Beds of Violets blew,
And fresh-blown Roses washt in dew,
Fill'd her with thee a daughter fair,
So bucksom, blith, and debonair.
Haste thee nymph, and bring with thee
Jest and youthful Jollity,
Quips and Cranks, and wanton Wiles,
Nods, and Becks, and Wreathèd Smiles,
Such as hang on Hebe's cheek,
And love to live in dimple sleek;
Sport that wrincled Care derides,
And Laughter holding both his sides.
Come, and trip it as you go
On the light fantastick toe
And in thy right hand lead with thee,
The Mountain Nymph, sweet Liberty;
And if I give thee honour due,
Mirth, admit me of thy crue
To live with her, and live with thee,
In unreproved pleasures free;
To hear the Lark begin his flight,
And singing startle the dull night,
From his watch-towre in the skies,
Till the dappled dawn doth rise;
Then to com in spight of sorrow,
And at my window bid good morrow,
Through the Sweet-Briar, or the Vine,
Or the twisted Eglantine,
While the Cock with lively din,
Scatters the rear of darkness thin,
And to the stack, or the Barn dore,
Stoutly struts his Dames before,
Oft list'ning how the Hounds and Horn
Chearly rouse the slumbring morn,
From the side of som Hoar Hill,
Through the high wood echoing shrill.
Som time walking not unseen
By Hedge-row Elms, on Hillocks green,
Right against the Eastern gate,
Where the great Sun begins his state,
Roab'd in flames, and Amber light,
The clouds in thousand Liveries dight,
While the Plowman neer at hand,
Whistles ore the Furrow'd Land,
And the Milkmaid singeth blithe,
And the Mower whets his sithe,
And every Shepherd tells his tale
Under the Hawthorn in the dale.
Streit mine eye hath caught new pleasures
Whilst the Lantskip round it measures,
Russet Lawns, and Fallows Gray,
Where the nibling flocks do stray,
Mountains on whose barren brest
The labouring clouds do often rest:
Meadows trim with Daisies pide,
Shallow Brooks, and Rivers wide.
Towers, and Battlements its sees
Boosom'd high in tufted Trees,
Wher perhaps som beauty lies,
The Cynosure of neighbouring eyes.
Hard by, a Cottage chimney smokes,
From betwixt two ages Okes,
Where Corydon and Thyrsis met,
Are at their savory dinner set
Of Hearbs, and other Country Messes,
Which the neat-handed Phillis dresses;
And then in haste her Bowre she leaves,
With Thestylis to bind the Sheaves;
Or if the earlier season lead
To the tann'd Haycock in the Mead,
Some times with secure delight
The up-land Hamlets will invite,
When the merry Bells ring round,
And the jocond rebecks sound
To many a youth, and many a maid,
Dancing in the Chequer'd shade;
And young and old com forth to play
On a Sunshine Holyday,
Till the live-long day-light fail,
Then to the Spicy Nut-brown Ale,
With stories told of many a feat,
How Faery Mab the junkets eat,
She was pincht, and pull'd she sed,
And by the Friars Lanthorn led
Tells how the drudging Goblin swet,
To ern his Cream-bowle duly set,
When in one night, ere glimps of morn,
His shadowy Flale hath thresh'd the Corn,
That ten day-labourers could not end,
Then lies him down the Lubbar Fend.
And stretch'd out all the Chimney's length,
Basks at the fire his hairy strength;
And Crop-full out of dores he flings,
Ere the first Cock his Mattin rings,
Thus done the Tales, to bed they creep,
By whispering Winds soon lull'd asleep.
Towred Cites please us then,
And the busie humm of men,
Where throngs of Knights and Barons bold,
In weeds of Peace high triumphs hold,
With store of Ladies, whose bright eies
Rain influence, and judge the prise,
Of Wit, or Arms, while both contend
To win her Grace, whom all commend,
There let Hymen oft appear
In Saffron robe, with Taper clear,
And pomp, and feast, and revelry,
With mask, and antique Pageantry,
On Summer eeves by haunted stream.
Then to the well-trod stage anon,
If Jonsons learnèd Sock be on,
Or sweetest Shakespear fancies childe,
Warble his native Wood-notes wilde,
And ever against eating Cares,
Lap me in soft Lydian Aires,
Married to immortal verse
Such as the meeting soul may pierce
In notes, with many a winding bout
Of lincked sweetness long drawn out,
With wanton heed, and giddy cunning,
The melting voice through mazes running;
Untwisting all the chains that ty
The hidden soul of harmony.
That Orpheus self may heave his head
From golden slumber on a bed
Of heapt Elysian flowres, and hear
Such streins as would have won the ear
Of Pluto, to have quite set free
His half regain'd Eurydice.
These delights, if thou canst give,
Mirth with thee, I mean to live.