From the book

“Upon their arrival [in spring], once-dormant hayfields effervesce with their songs, described by one naturalist as a ‘bubbling delirium of ecstatic music . . . like sparkling champagne.’ They’re ‘a mad, reckless song-fantasia, an out-break of pent-up, irrepressible glee,’ echoed another . . . it’s an ecstatic jumble of reedy, bubbling notes on different pitches. Each male has two slightly different versions . . .”

Imagine yourself in the old hayfields when they first arrive in spring and just listen! Concentrate and you should hear the two different songs this male has to sing. In the first 54 seconds are five songs (some much longer than others), and in each song listen for the tinkling cascade of tiny notes dropping down the scale about one second into the song. Then, at 1:03, that tinkling cascade is replaced with a series of reedy notes, and the male offers three renditions of this second song.