Blowing on a vuvuzela

I hadn't realised until I heard him again on Sunday evening, that our vuvuzela man has been absent over the past few weeks.
There's someone in our area that blows the vuvuzela almost every evening.
On Sunday it was quiet a long performance ;-) like a coded message or a bird's mating call, the same tune (message) over and over.

I replied with two short bursts of my own, but it was not the answer he was hoping for.