Soothing whistle!

I was walking on the side path of a mall and heard soothing whistle. I was too absorbed in my thoughts and calculations that I didn’t bother who it could be. I walked a few more paces and this time whistle started and continued for a long time. Who could whistle breathlessly for such a long time? I turned my head towards the sound. Oh! It was a caged bird!

Knowing this, should I be disappointed or happy?