Why is the skylark shouting?

We’re doing a daily bird-watching hour as part of our family coronavirus WhatsApp group. Obviously there’s quite a big risk of repetition of sightings of sparrows, or the Groundhog Day magpie who learns anew each morning that it can’t hang onto the fat ball feeder long enough to get a bite in, so I was dead pleased yesterday to see a lark rising vertically up into the blue sky from the moorlands on the ascent of Tor y Foel (social distancing of at least 200m from the four other people I saw also out for a bit of exercise).