At the first hint of light in the east,the tweets and chirps start up. By the time I step outside for a pre-dawn walk, the chorus of the birds is in full swing. No need for earbuds and music when one has serenading singers all around.
I looked up the phenomenon and found this link, which explains why birds like to sing so early.
There is even an example audio of the dawn chorus at the link, a recording made in the UK. But it pales in loudness and vigor in comparison with the loud suburban cardinals, chickadees, nuthatches, robins, mourning doves and other birds in this part of the world.The dawn chorus occurs when birds sing at the start of a new day. In temperate countries this is most noticeable in spring when the birds are either defending a breeding territory, trying to attract a mate, or calling in the flock. In a given location, it is common for different species to do their dawn singing at different times.
I had read elsewhere that birds in urban and (presumably, by extension, the suburbs) are louder than their forest counterparts, maybe because they need to make themselves heard above the usual sounds of motor vehicles, lawn mowers, blowers and such. Or it could also be that the birds were in better physical shape, feeding at the bounteous birdfeeders that dot the area. Or a combination thereof.
Here is an audio sample of the dawn chorus:
And now, for no particular reason, except cuteness galore, a photo of a baby robin from near my office. We engaged in a staring match for a few minutes, till my attempt to move in for a close range photo spooked it and it mustered the requisite skill to fly away.