"The Song That Never Ends"
by Norman Martin 
performed by Shari Lewis
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Original chords:

C                             G
This is the song that doesn't end.

G                         C
Yes, it goes on and on my friend.

C                                  G
Some people started singing it not knowing what it was,

    D7                             G
And they'll continue singing it forever just because

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(slightly more sophisticated chord version)

C                             G
This is the song that doesn't end.

G                         C
Yes, it goes on and on my friend.

C           E7                     A7
Some people started singing it not knowing what it was,

    D7                             G
And they'll continue singing it forever just because