This made me wonder whether it was simply about spring, or about the poet’s voice returning after a period of silence. Nicely suggestive. It also made me wonder about the length of the lines… do we need ‘a clump’ in the second line, for instance? Could the last line not have an adjective to bring the hill to life? Anyway I like the phrase ‘tangled bushes’ as it provides a nice image of the cuckoo hidden within. Sound, season and visual interest are contained in an evocative call from the heart of nature….