Lots and lots of songs:
Lavenders Blue and Train Whistle Blowing when he's singing a small child to sleep...

Rattlin' Bog and Home, Boys, Home on long car journeys in the days when there was no other music to be had...

Dirty Old Town when he's been reminiscing about his childhood...

Wild Rover when he's had one to many...

Grey Funnel Line when he really should be off to bed now...

But he is most famed for his roaring renditions of O'Reilly's Daughter, Rawtenstall Annual Fair and Brother Sylveste - classics all!!