the truth about the shape of the Earth has been floating around for centuries, with Greek philosopher Pythagoras speculating that the Earth was actually spherical even before his death in 495 B.C.
Dangus has the first answer - Around the World - Daft Punk 1000 Miles - The Proclaimers All Around the World - Oasis Fly Me To The Moon - Frank Sinatra In America - Neil Diamond I Still Call Australia Home - Peter Allen 99 Luftballoons - Nena (there is no am horizont on a flat earth and balloons arent real nor can they float upwards. apparently. or something.)
PS - most of these suggestions are bloody awful. FAIL!