Top 20 most popular songs of all time

It's hard to come by data for world popularity, so of course this isn't completely accurate. Here is the methodology though (note, this does not belong to me - check link for more info): THE MOST POPULAR TRACKS ACCORDING TO PAID DOWNLOADS, SINGLE-SALES AND AIRPLAY SALES (70%) SINGLE-SALES AND PAID DOWNLOAD STATS FROM USA, JAPAN, UNITED KINGDOM, GERMANY, FRANCE, AUSTRALIA, ITALY, SPAIN, NETHERLANDS, BELGIUM, NORWAY, SWEDEN, FINLAND, DENMARK, AUSTRIA, SWITZERLAND, IRELAND, GREECE, CANADA, AND NEW ZEALAND. AIRPLAY (30%) THE OFFICIAL NATIONAL AIRPLAY-CHARTS FROM USA, JAPAN, UNITED KINGDOM, GERMANY, FRANCE, ITALY, SPAIN, AUSTRALIA, CANADA, AUSTRIA, SWITZERLAND, SWEDEN, NORWAY, DENMARK, FINLAND, NETHERLANDS, BELGIUM, IRELAND, GREECE, HUNGARY, POLAND, CZECH REPUBLIC, AND NEW ZEALAND. THE CHARTS ARE WEIGHTED TO THE SIZE OF ITS MARKETS ACCORDING TO THE LATEST IFPI-STATISTICS PLAYLISTS FROM HUNDREDS RADIO-STATIONS IN ALBANIA, ARGENTINA, BELARUS, BOLIVIA, BRAZIL, BULGARIA, CHINA, CHILE, COLOMBIA, CROATIA, CYPRUS, ECUADOR, EESTI, EL SALVADOR, FAROE ISLANDS, GEORGIA, GUAM, HONG KONG, ICELAND, INDIA, ISRAEL, KENYA, LATVIA, LEBANON, LITHUANIA, MACEDONIA, MALAYSIA, MEXICO, PANAMA, PARAGUAY, PERU, PHILIPPINES, ROMANIA, RUSSIA, SINGAPORE; SLOVAKIA, SLOVENIA, SOUTH AFRICA, SRI LANKA, THAILAND, TURKEY, UKRAINE, VENEZUELA, AND YUGOSLAVIA. PLAYLISTS FROM VARIOUS TV-MUSIC CHANNELS Source and more at: http://www.mediatraffic.de/alltime-track-chart.htm