From Wikipedia

---Quote---
The rooster is often (accurately) pictured in art as crowing at the break of dawn. He can often be seen sitting on fence posts or other objects, where he crows to proclaim his territory. However, a rooster might crow at any time of day, if he looks into the sun - even sometimes on a bright moonlit night. He has several other calls as well, and can cluck the same as a hen. Roosters will occasionally make a pattern following clucking sound to attract hens to a source of food.
---End Quote---
Source(s):
http://en.wikipedia.org/wiki/Rooster

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Oh gosh, well I used to have roosters where I live, (in the country) but they sadly are gone (neighbors moved).
I used to wonder this too.

Theories/Speculation
*Theories as to why roosters crow vary from disturbances in the coop at night, to neighborhood sounds that may seem to the rooster to be a sign of impending attack on his flock. A car starting will set the rooster crowing and perhaps this may be a territorial crowing similar to the barking of a dog protecting his territory. Switching on a light in the middle of the night will start a crowing fest; this may be because roosters believe the sun is rising.

There always is a reason why the rooster crows. Also why they crow at diffent times of the day.
*They crow because they hear other roosters crowing (you can get chain reactions). Other things that seem to set them off: to show that a certain place in the barnyard is their turf; to try and assert their own authority to another roo; hearing a hen cackle after it has laid an egg.
Source(s):
http://www.joecliffordfaust.com/chickens/chickenfaq.html#crow

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