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From School Library Journal, 1994:
Paul has written a song, but his parents are too busy to listen. So, he decides to search out his "magic grandmother" and sing it for her. Wearing his magic hat, he meets a flying pig, a blue-eyed caterpillar, a policeperson, the North wind, a singing cat, and four wolves, all of whom help the boy to find the woman and to bring this stilted, contrived story to its merciful end.
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These are wonderful paintings, but I can imagine that they might make kind of a clunky story. Here is the rest of the SLJ review as well as a review from Booklist and one from Publishers Weekly.