The tune you might be hearing is Crockett's Theme by Jan Hammer, from the TV program Miami Vice.
It is used in a Tessen (fan) kata performed during displays.
Training for ages 14+ are Monday and Wednesday 730pm to 930pm, Paradigm Martial Arts, 100 Sefton Lane, Maghull L31 8BT.
Juniors (4+ to 16) train on a Saturday 12pm to 1pm, Litherland Sports Park, Boundary Road, Litherland L21 7LA.
Juniors and adults train together on a Thursday 430pm to 530pm at Litherland Sports Park.