"Wilf's Wiggle"
From Tardis Wiki, the free Doctor Who reference
"Wilf's Wiggle" was a musical piece composed by Murray Gold.
It was used in Part 1 of The End of Time, as Wilf leaves his house to join the so-called Silver Cloak, a group of pensioners dedicated to tracking down the Doctor. It has a whimsical tone, fitting Wilf's positive attitude.
The piece is featured on Murray Gold's soundtrack Doctor Who: Series 4 - The Specials.