Here's topical tom's link:

http://www.emusic.com/album/Doc-Watson-Songs-for-Little-Pickers-MP3-Download/10942393.html

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One song that I found many pre-school children like to sing is Sesame Street's C Is For Cookie

C is for cookie.
It's good enough for me.
C is for cookie.
It's good enough for me.
C is for cookie.
It's good enough for me.
Oh, cookie, cookie, cookie starts with C.

-snip-

My daughter teaches children the American Sign Language alphabet. Children in her classroom make the C sign when they are singing this song. Also, she changes the song to fit some other letters of the alphabet {with children suggesting some objects/items that begin with that letter}. For instance, "A" is for apple/it's good enough for me/etc" and "B" is for ball/it's good enough for me".

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See this link for the song Where Is Thumpkin :
http://kids.niehs.nih.gov/lyrics/thumbkin.htm . That website has a midi {the tune is Frère Jacques)and performance instructions.

Here are the words to the first verse as given on that website:

Where is thumbkin?
Where is thumbkin? (Hands behind back)
Here I am (Bring right hand out from behind back with thumb)
Here I am (Bring left hand out from behind back with thumb)
How are you today, sir? (Move right thumb as if talking)
I am fine, thank you (Move left thumb as if responding.)
Happy day (Clap)
Happy day (Clap)

-snip-

The words that I sing are slightly different:

Where is thumbkin?
Where is thumbkin? (Hands behind back)
Here I am (Bring right hand out from behind back with thumb)
Here I am (Bring left hand out from behind back with thumb)
How are you today, sir? (Move right thumb as if talking)
Very well, I thank you (Move left thumb as if responding.)
Run away. Go and play. {Move hands behind back again}