I am looking for a picture book I read as a child in the 1970s.  Publication would have to be before 1978, no clue what decade.

A boy goes walking through a landscape (forest?) and comes upon different animals. Each one has a musical instrument and joins his entourage. It sounds like a parade, but it seemed more like a Pied Piper of Hamelin situation where he somehow got them all to follow him. At one point I remember a big tree. I don’t remember how it ended. The illustrations were line drawings in a style similar to Ernest Shepard (Winnie-the-Pooh).

IT IS NOT:
The Parade of the Animals by James Abell Wright
Sophie’s Animal Parade by Amy Dixon
Animal Parade by Jakki Wood
Animals on Parade by Molly Burke Hamilton
Animal Parade by Clare Youngs

Thank you for your help!