Whilst certainly not one of his well-known works, two years ago I discovered Burns's Impromptu on Mrs. Riddell's Birthday, written to his long-time friend, Maria Riddell:

OLD Winter, with his frosty beard,
Thus once to Jove his prayer preferred:
“What have I done of all the year,
To bear this hated doom severe?
My cheerless suns no pleasure know;
Night’s horrid car drags, dreary slow;
My dismal months no joys are crowning,
But spleeny English hanging, drowning.

“Now Jove, for once be mighty civil.
To counterbalance all this evil;
Give me, and I’ve no more to say,
Give me Maria’s natal day!
That brilliant gift shall so enrich me,
Spring, Summer, Autumn, cannot match me.”
“‘Tis done!” says Jove; so ends my story,
And Winter once rejoiced in glory.

http://www.bbc.co.uk/robertburns/wor...ells_birthday/

T.