Apparently, as there are only a small number of musical notes to compose with. It is inevitable that eventually over a period of time that some songs are going to sound the same. If we include homage and influence into the equation we have some interesting results. To prove this theory play the following titles back to back...

Jefferson Airplane "White Rabbit" V Bjork "Human Behaviour"

ELO "Over the Border" V The Beach Boys "Heroes and Villains"

Cher "Halfbreed" V Joe Walsh "Life's Been Good"

Have Fun!