Do birds sing this early?

I hear birds singing at 3.08 am in the morning today May 2nd 2018!

This is the earliest ever I have heard birds singing.

I wonder what bird it is?

Sounds great...Hope it's singing with joy and not alarm.

Googled why birds sing early and came up with this
https://www.thestar.com/news/insight/2014/06/01/wild_in_the_city_robin_and_cardinal_begin_the_dawn_chorus.html