The most ive had is 14 seperate birds at once all chirping away during a walk rou d stanmer Park near Brighton. The next thing will he a bird call translator. Pretty one-note I imagine.

'I'm available for sex'
'Stay away from my territory'
'Stay away from my territory'
'Stay away from my territory'
'I'm available for sex'
'Stay away from my territory
'Stay away from my territory
'I'm available for sex'

Basically Wigan on a Friday night but more tuneful.