There is a unique sound that spreads throughout the city.
This is the source of the huge "swarm of bees" that haunts Lisbon.

 

Misuse

 

Recorded ten minutes after I bought my first sound recorder. This is a special one

 

Live on tape

 

Soho Sq.

 

30 glass bottles rolling down the street.

 

My laptop does the exact same sound almost every time I touch it.