Union
$$A \cup B =$$
{ Heterophonic, Homophonic, Homorhythmic, Monophonic, Polyphonic, fable, fairy-tale, folk-tale, myth, saga }
Symmetric Difference
$$A \ominus B =$$
{ Heterophonic, Homophonic, Homorhythmic, Monophonic, Polyphonic, fable, fairy-tale, folk-tale, myth, saga }
Cartesian Product
$$A \times B =$$
{ (Heterophonic, fable),
(Heterophonic, fairy-tale),
(Heterophonic, folk-tale),
(Heterophonic, myth),
(Heterophonic, saga),
(Homophonic, fable),
(Homophonic, fairy-tale),
(Homophonic, folk-tale),
(Homophonic, myth),
(Homophonic, saga),
(Homorhythmic, fable),
(Homorhythmic, fairy-tale),
(Homorhythmic, folk-tale),
(Homorhythmic, myth),
(Homorhythmic, saga),
(Monophonic, fable),
(Monophonic, fairy-tale),
(Monophonic, folk-tale),
(Monophonic, myth),
(Monophonic, saga),
(Polyphonic, fable),
(Polyphonic, fairy-tale),
(Polyphonic, folk-tale),
(Polyphonic, myth),
(Polyphonic, saga) }