I can break out into song at any time while riding.
Manowar, Metallica, Polysics ect
When training on mountains its been
Ride up the mountain,
Ride up the mountain,
Ride up the mountain,
to the tune of ride of the Valkyries
Or I hurt myself today, Nine Inch Nails.
At the end of very long rides it always defaults into Hungry Man by Louis Jordan.