Whilst many clubs now use "You're just a small town in <<Insert Local Rivals>>", Rovers lay claim to starting it, as "A small town in Yorkshire" when the clubs played in 1995.
The song is to the tune of guantanamera and is simply
Small town in Yorkshire,
You're just a small town in Yorkshire,
Small town in Yorkshire,
You're just a small town in Yorkshire,
(repeat)
Of course, even Rovers now use it insult many rival teams. The fans have even turned it on it head and use "We're just a small town in Europe" on European trips (see This YouTube Video).