Lol I can relate to that! Buster loves Bonfire Heart by James Blunt and requests it whenever we are in the car...over and over. And over. I don't mind the song but after 20 times there will a tantrum when I refuse to play it again!
Not my toddler, but at the Robbie Williams concert I went to the other day, he told the audience that his daughter (Teddy) listens to Beyonce's "Single Ladies" over and over. Apparently he put on one of his own songs once, said "Shall we listen to a bit of Daddy?" and she screamed until he put Beyoncé back on