I love the sounds of birds singing first thing in the morning, wake up in bed with the light shining through your window early morning, it's like an alarm clock really and the birds are your alarm.
I've mentioned this before, in Australia when we had our house in the bush, sit outside on our patio early morning and listen to the black field crickets chirping away, normally summertime with a few cans of lager and then fall asleep and get woken up with bloody Australian bush fly's attacking you.