Elmer and the Tune, Paperback/David McKee

Elmer meets Rose at a point during which she has a song stuck in her head, with the song passed on to become stuck in Elmer's own head. As Elmer spreads the infectious tune across the creatures of the jungle, it occurs to him that getting everyone to sing Happy Birthday might bring some collective respite. Typical warmth, humour and family appeal from the 25th in the series.