You are all I see.

On the first day of Christmas, 
my true love sent to me 
A partridge in a pear tree. 

On the second day of Christmas, 
my true love sent to me 
Two turtle doves, 
And a partridge in a pear tree. 

On the third day of Christmas, 
my true love sent to me 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the fourth day of Christmas, 
my true love sent to me 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the fifth day of Christmas, 
my true love sent to me 
Five golden rings, 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the sixth day of Christmas, 
my true love sent to me 
Six geese a-laying, 
Five golden rings, 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the seventh day of Christmas, 
my true love sent to me 
Seven swans a-swimming, 
Six geese a-laying, 
Five golden rings, 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the eighth day of Christmas, 
my true love sent to me 
Eight maids a-milking, 
Seven swans a-swimming, 
Six geese a-laying, 
Five golden rings, 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the ninth day of Christmas, 
my true love sent to me 
Nine ladies dancing, 
Eight maids a-milking, 
Seven swans a-swimming, 
Six geese a-laying, 
Five golden rings, 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the tenth day of Christmas, 
my true love sent to me 
Ten lords a-leaping, 
Nine ladies dancing, 
Eight maids a-milking, 
Seven swans a-swimming, 
Six geese a-laying, 
Five golden rings, 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the eleventh day of Christmas, 
my true love sent to me 
Eleven pipers piping, 
Ten lords a-leaping, 
Nine ladies dancing, 
Eight maids a-milking, 
Seven swans a-swimming, 
Six geese a-laying, 
Five golden rings, 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree. 

On the twelfth day of Christmas, 
my true love sent to me 
Twelve drummers drumming, 
Eleven pipers piping, 
Ten lords a-leaping, 
Nine ladies dancing, 
Eight maids a-milking, 
Seven swans a-swimming, 
Six geese a-laying, 
Five golden rings, 
Four calling birds, 
Three French hens, 
Two turtle doves, 
And a partridge in a pear tree! 

"The Twelve Days of Christmas" is a cumulative song, meaning that each verse is built on top of the previous verses. There are twelve verses, each describing a gift given by "my true love" on one of the twelve days of Christmas.
...and so forth, until the last verse:
On the twelfth day of Christmas, my true love gave to me..
12 Drummers Drumming
11 Pipers Piping
10 Lords-a-Leaping
9 Ladies Dancing
8 Maids-a-Milking
7 Swans-a-Swimming
6 Geese-a-Laying
5 Gold Rings
4 Colly Birds
3 French Hens
2 Turtle Doves
And a Partridge in a Pear Tree.

Annoying Orange