Have you heard of Bird Vocalization? Sounds like music playing in your ears.
I've never heard of that, what exactly is it?
Basically birds use vocalization with courtship and mating, they also use their melodies for alarms and to keep in contact with each other.
OH, I understand now.  I certainly love hearing them twittering away in the morning.  Do different breeds have different vocalizations?
Yes different species use different calls for all kinds of things, they can be very complex or very simple. Its just amazing.