You can play along with these recordings of Polly Wolly Doodle: http://stream.schools.utah.gov/videoarchive/faa2/Track24.mp3 (with voice)
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Although this video version is in the key of A (instead of F, so don't play along),
it may be helpful to listen to the melody and
pronunciation here:
https://www.youtube.com/watch?v=9Zvd5Mbdqkg
https://www.youtube.com/watch?v=9Zvd5Mbdqkg