Final approach ...

Skylark (Alauda arvensis)

Rising almost vertically from farmland, grassland, salt marshes, heathland and moorland, male skylarks can be observed, effortlessly hovering and singing from a great height before suddenly parachuting back down to earth. Their long and complicated song-flights can last for up to an hour and the birds can reach several hundred metres before descending. They'll also sing from perches such as fence posts or large rocks. Despite their aerial activities, skylarks nest on the ground, laying three to four eggs. Chicks become independent after only two weeks and parents can have up to four broods in a breeding season.

They are, at least to me, the vocal delight of spring and high summer ...

References:

Gutteridge, T., (2014). Skylark. The Birds of Sussex. Thetford: British Trust for Ornithology (BTO) Books on behalf of the Sussex Ornithological Society, pp. 427-428.

Scott-Ham, M. (1996). Skylark. Birds of Sussex. Sussex Ornithological Society, pp. 383-385.

The Wildlife Trusts (2015). Skylark [Online]. Available from: http://www.wildlifetrusts.org/species/skylark [Accessed, 23 April 2015].