All of whom play looped-versions of what is supposed to be the first sixteen bars of the 'Romanian' Anniversary Song...
(You know the tune if not the name.
It is beautifully sung here by the genius tenor Andy Williams
- http://www.youtube.com/watch?v=ekduN2N0eTY )
...except that these versions are played by one finger on an accordeon, 'un-barred' in tempo, and have variable numbers of notes before repeating, and repeating, and repeating...
A particularly pernicious form of noise pollution.