A bootleg is a record that contains an illegal or unauthorized recording
of the band. They're also called "ROIO's": Recording Of Illegal/
Indeterminate Origin. These recordings are used to make LP's and in the
last few years CD's. Most have a catchy title and a nice photograph on the
front. How about the first Hogarth-Marillion CD bootleg, which is called
"Something Fishy Going On"....

The source of the recordings can vary from someone who taped a concert
with his walkman, to an original DAT recording directly from the equipment
of the band. Sometimes a radio broadcast is used. Quality of the bootleg
can vary from very poor to excellent.