Mystery bird

This morning when I got home after a gym workout session with @omsoc, I heard this bird singing, so I had to record it with my phone.

I was wondering, what the bird is, because I couldn't see it anywhere. There seem to be two of them having a discussion. But the melody is interesting. It is like they've been listening to some kind of music and incorporated that into their song. Maybe it's a telephone alarm sound or a computer game.

If you want to incorporate this sample into your music, please leave me a note. :)