Did Jenny Lind ("The Swedish Nightingale") write the music for "Few Days"?
Jenny Lind first was brought to America by P. T. Barnum. She was a great success in opera and concert across the land, but also sang Ethiopian or minstrel songs.
"...she composed and sang on her concerts some Ethiopian songs- composing one- "Few Days" that became very popular. The lyrics are by the famous Lucy Long, the first line being "Come darkies all, we'll sing a song, few days, few days."
The song was used by the Know Nothing Union, with the words, ""Our country now is great and free, few days, few days," and include subjects as patriotism, pride and political platforms. It became a United American song with lyrics: "a subtle foe has plotted along, few days, few days" and contained lyrics on campaigns, battles, political elections, ballots and patriotism."
From The Minstrel Show

FEW DAYS
Lucy Long and Jenny Lind, 1854

Come darkies all, we'll sing a song,
Few days, few days.
The words were made by Lucy Long.
I'm going home.
The music was set by Jenny Lind,-
Few days, few days.
It's sung by darkies to raise the wind.
I'm going home.

I've a right good home out yonder,
Few days, few days.
Right good home out yonder,
I'm going home.
Can't stay in dis ere city
Few days, few days.
Can't stay in dis ere city,
I'm going home.

The world is growing now so wise,
Few days, few days.
That wings we'll shortly have like flies.
I'm going home.
Now wooden legs and cut(?) glass eyes,
Few days, few days.
Fail to excite the least surprise,
I'm going home.

Chorus

Now everything is new and strange,
Few days, few days
On every hand is written change,
I'm going home.
There's politics is not the same,
Few days, few days.
Each party now has lost its name,
I'm going home.
Chorus
The New Reform have gained the day,
Few days, few days.
And swarm from Dan to Bersheba!
I'm going home.
But here we can no farther go,
Few days, few days.
For about them here we nothing know,
I'm going home.
Chorus
The Telegraph and Iron Horse,
Few Days, few days,
Are looked upon as things of course,
I'm going home.
There are no boys they are all men
Few days, few days.
And girls are ladies when they're ten.
I'm going home.
Chorus
And here's a secret I've been told,
Few days, few days.
That women never do grow old,
I'm going home.
And this the reason it may be,
Few days, few days.
That only infant waists we see
I'm going home.
Chorus

(Seems a couple of these complaints were still heard not so many years ago)
W. C. Peters & Sons, Ethiopian Songs (20 in folder), Cincinnati, Ohio, 1854. On the first sheet of music- Words by Lucy Long Music by Jenny Lind. Sung by Christy's Minstrels.

http://levysheetmusic.mse.jhu.edu/levy-cgi/display.cgi?id=022.044.000;pages=4;range=0-3