Mothercare Nursery Rhymes ?late 1960s

This simple book is one of my earliest memories. Each nursery rhyme had the music annotated with colour-coded bars, which corresponded to colours on a xylophone. We felt free to edit the words and pictures, and the image below is one of the least damaged! Although this precious item is kept safe in our family, I would love to get my hands on a better, working copy.