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Roosters tend to crow upon waking up, and since roosters tend to wake up prior to sunrise. We’re more likely to assume this is dawn than earlier because humans tend to wake up at dawn, not earlier. It’s likely their crowing is in part a response to waking up ("Hey guys! I’m awake now!") and when the sun starts to shine through their coop, they respond to the light as well. Also, early morning crowing is often a territorial and dominance establishing ritual, especially if there is more than one rooster or they can hear each other across different yards; it is the dominant rooster that crows first, followed by the subordinate roosters. As the morning goes on, most other forms of rooster crowing are likely forms of varied communications, like being bothered by something or showing off to the hens in courtship displays.