There is a great 1950s blues song written by New Zealander
Johnny Cooper called "Lonely Blues". I have taught it to my class
of 7-8 year olds and they loved it, and it can be sung as a round.
I could find the chords if anyone was interested.

        LONELY BLUES
                 by Johnny Cooper

Look what you've done, what you've done, my baby
Look what you've done, what you've done, my baby
Look what you've done to my heart.


We made a date and you said maybe
Then you ran away with another baby
Look what you've done to my heart


I've got those lonely, lonely, lonely, lonely blues
Lonely, lonely, lonely, lonely blues
I've got those lonely, lonely, lonely, lonely blues
Those lonely lonely blues