Walking on Sunshine
"Walking on Sunshine" is a song performed by Katrina and the Waves and released in 1985. On Futurama, the song remains a favourite of Philip J. Fry's, despite only knowing the line "I'm walking on sunshine", after which he hums the rest.
Four times have we seen Fry sing the song, three of which were in the shower. He even taught the song to his dog, Seymour Asses, back in (or sometime after) 1997, whom could bark the tune of the song. [4ACV07] When Fry died in a dream sequence, it was performed at his funeral by Scruffy on bagpipes. [4ACV12] Later, he uses it as a ring tone for his mobile phone. [ItWGY]