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.
Summer for me starts with the first of the Spring and Summer migrants - Swallow, Whitethroat and Chiffchaff, although the very early ones of the latter may have overwintered. Soon followed by Swift, which for almost as long as I have been in North Wales - 25 years now - have turned up on May 12th.
How better to start this post than with a quote from the writings of Richard Jefferies:
The fervour of the sunbeams descending in a tidal flood rings on the strung harp of earth. It is this exquisite undertone, heard and yet unheard, which brings the mind into sweet accordance with the wonderful instrument of nature.—' The Life of the Fields': The Pageant of Summer.