Rufous-crowned Sparrows (Aimophila ruficeps) sing this Spring song when they're looking for love around Peck's Lake [Arizona]. This one was in the creosote scrub which grows on the steep hillsides around the lake.
Rufous-crowned Sparrows (Aimophila ruficeps) are one of the most common sparrows in Costa Rica. They like urban and semi-rural field environments, like parks, soccer fields, etc. This song is sung over and over, and loudly!