Singing teaches rhythm and helps with speech and is great fun for your preschooler. Your child will likely pick up the theme songs to his/her favorite show or movie, and possibly the words to a few songs they hear you listen to frequently, but there are also many, many other songs that you may want to consider. Here are some examples of common songs you might sing with your child. I've included the song name, a demonstration video/audio clip, and the lyrics, in case you don't already know the song.
Educational:
The Alphabet Song (there are multiple versions, so use the one you are familiar with) Audio - Lyrics
The Vowel Song Audio - Lyrics
Head Shoulders Knees and Toes Audio - Lyrics
One, Two Buckle My Shoe Audio - Lyrics
Jesus Loves The Little Children Audio - Lyrics
Silly Songs:
Row-row-row your boat Audio - Lyrics
Itsy-bitsy Spider Audio - Lyrics
Happy Birthday Audio - Lyrics
Do your ears hang low? Audio - Lyrics
Ring-around-the-rosie Audio - Lyrics
London Bridge is Falling Down Audio - Lyrics
Mary Had a Little Lamb Audio - Lyrics
Old MacDonald Had a Farm Audio - Lyrics
The Ants go Marching Audio - Lyrics
Hokey Pokey Audio - Lyrics
Father Abraham Audio - Lyrics
Five Little Monkeys Jumping on a Bed Audio - Lyrics
High-ho the dairy-oh Audio - Lyrics
How Much Is That Doggy In The Window? Audio - Lyrics
If You're Happy and You Know It Audio - Lyrics
I'm a little tea pot Audio - Lyrics
For He's a Jolly Good Fellow Audio - Lyrics
Yankee Doodle Audio - Lyrics
The Muffin Man Audio - Lyrics
Frere Jacque Audio - Lyrics
Twinkle Twinkle Little Star Audio - Lyrics
This Old Man Audio - Lyrics
Wheels of the Bus Audio - Lyrics
Hush Little Baby Audio - Lyrics
Rock a Bye Baby Audio - Lyrics
Skip to my Lou Audio - Lyrics
B-I-N-G-O Audio - Lyrics
Patty Cake Audio - Lyrics
Take me Out to the Ball Game Audio - Lyrics
Oh, My Darlin' Audio - Lyrics
This is the way we... Audio - Lyrics
Pop Goes the Weasel Audio - Lyrics
Battle Hymn of the Republic Audio - Lyrics
Deep and Wide Audio - Lyrics
The Grand Old Duke Of York Audio - Lyrics
Hickory, Dickory, Doc Audio - Lyrics
There was an old lady who swallowed a fly Audio - Lyrics
I'm being eaten by a Boa Constrictor Audio - Lyrics
Christmas Carols:
Rudolph the Red-nosed Reindeer Audio - Lyrics
Silent Night Audio - Lyrics
We Three Kings Audio - Lyrics
Away in a Manger Audio - Lyrics
O Holy Night Audio - Lyrics
The First Noel Audio - Lyrics
Frost the Snowman Audio - Lyrics
The 12 Days of Christmas Audio - Lyrics
Educational:
The Alphabet Song (there are multiple versions, so use the one you are familiar with) Audio - Lyrics
The Vowel Song Audio - Lyrics
Head Shoulders Knees and Toes Audio - Lyrics
One, Two Buckle My Shoe Audio - Lyrics
Jesus Loves The Little Children Audio - Lyrics
Silly Songs:
Row-row-row your boat Audio - Lyrics
Itsy-bitsy Spider Audio - Lyrics
Happy Birthday Audio - Lyrics
Do your ears hang low? Audio - Lyrics
Ring-around-the-rosie Audio - Lyrics
London Bridge is Falling Down Audio - Lyrics
Mary Had a Little Lamb Audio - Lyrics
Old MacDonald Had a Farm Audio - Lyrics
The Ants go Marching Audio - Lyrics
Hokey Pokey Audio - Lyrics
Father Abraham Audio - Lyrics
Five Little Monkeys Jumping on a Bed Audio - Lyrics
High-ho the dairy-oh Audio - Lyrics
How Much Is That Doggy In The Window? Audio - Lyrics
If You're Happy and You Know It Audio - Lyrics
I'm a little tea pot Audio - Lyrics
For He's a Jolly Good Fellow Audio - Lyrics
Yankee Doodle Audio - Lyrics
The Muffin Man Audio - Lyrics
Frere Jacque Audio - Lyrics
Twinkle Twinkle Little Star Audio - Lyrics
This Old Man Audio - Lyrics
Wheels of the Bus Audio - Lyrics
Hush Little Baby Audio - Lyrics
Rock a Bye Baby Audio - Lyrics
Skip to my Lou Audio - Lyrics
B-I-N-G-O Audio - Lyrics
Patty Cake Audio - Lyrics
Take me Out to the Ball Game Audio - Lyrics
Oh, My Darlin' Audio - Lyrics
This is the way we... Audio - Lyrics
Pop Goes the Weasel Audio - Lyrics
Battle Hymn of the Republic Audio - Lyrics
Deep and Wide Audio - Lyrics
The Grand Old Duke Of York Audio - Lyrics
Hickory, Dickory, Doc Audio - Lyrics
There was an old lady who swallowed a fly Audio - Lyrics
I'm being eaten by a Boa Constrictor Audio - Lyrics
Christmas Carols:
Rudolph the Red-nosed Reindeer Audio - Lyrics
Silent Night Audio - Lyrics
We Three Kings Audio - Lyrics
Away in a Manger Audio - Lyrics
O Holy Night Audio - Lyrics
The First Noel Audio - Lyrics
Frost the Snowman Audio - Lyrics
The 12 Days of Christmas Audio - Lyrics