Dating football fans
"Sloop John B" has been popular amongst English football fans since the mid-2000s. Since then more high-profile teams have followed suit, usually with different lyrics for their own teams, most notably Watford, with Newcastle, Blackpool, Middlesbrough and Hull also adopting the song as their own.
They are one of the last remaining sources of an oral folk song tradition in the United Kingdom.
Other examples include the United States' "I believe that we will win! Amongst others, it has spawned the song "You're not singing anymore! Many football crowd chants/songs are to the tune of "La donna è mobile" from Giuseppe Verdi's opera Rigoletto, for example the chant by Derby County fans in honour of Fabrizio Ravanelli of "We've got Fabrizio, you've got fuck allio".
Italian tifosi employ various operatic arie, especially those by Giuseppe Verdi, for chants.
Traditions vary from country to country and team to team, but they are generally used either to encourage the home team or slight the opposition.
Not only do fans sing songs to directly slight the opposition they are playing that day; many teams sing songs about their club rivals, even if they are not playing them.