For many musicians and composers birdsong is the ultimate musical composition - yet is it music: Birds use variations of rhythm, relationships of musical pitch, and combinations of notes that resembles music, but without fixed musical intervals, as on a scale, there is a chaotic randomness to their singing.
What better introduction to Spring than this quotation from the writings of Richard Jefferies.
"The bird upon the tree utters the meaning of the wind—a voice of the grass and wild-flower, words of the green leaf; they speak through that slender tone. Sweetness of dew and rifts of sunshine, the dark hawthorn touched with breadths of open bud, the odour of the air, the colour of the daffodil—all that is delicious and beloved of springtime are expressed in his song. Genius is nature and his lay, like the sap in the bough from which he sings, rises without thought". —’ Field and Hedgerow’: Hours of Spring. Richard Jefferies