I can name 34 instead of the 20 you've asked for -
Global iTunes Artist Ranking:
Pos Pos+ Artist Points Songs #1s Albums #1s Top Country Countries
1 = Pharrell 4943 3322 50 1621 62 Switzerland 113
2 +1 Katy Perry 2629 1955 3 674 0 Indonesia 114
3 -1 Avicii 2605 1946 2 659 1 Brazil 111
4 +1 Shakira 2450 1830 2 620 1 Canada 108
5 -1 Rihanna 2439 2007 1 432 0 Saint Kitts and Nevis 115
6 +2 Beyoncé 2118 1083 0 1035 4 United Kingdom 113
7 +2 Bruno Mars 2062 1291 0 770 0 Philippines 111
8 -2 Pitbull 2045 1884 2 161 0 Mexico 116
9 -2 One Direction 2032 823 0 1210 0 Japan 116
10 = Eminem 1828 1154 0 674 1 South Africa 114
11 +1 Lorde 1817 1160 0 657 0 New Zealand 110
12 -1 Imagine Dragons 1814 1208 1 606 0 Ireland 112
13 = Daft Punk 1767 992 0 775 0 France 113
14 +52 Coldplay 1740 779 3 962 2 Netherlands 93
15 -1 Adele 1561 901 0 660 3 Russia 111
16 -1 OneRepublic 1217 943 1 275 0 Australia 103
17 -1 John Legend 1203 848 7 355 0 Netherlands 91
18 -1 Miley Cyrus 1156 917 0 239 0 Philippines 109
19 +37 Rick Ross 1091 222 0 869 4 United States 81
20 +32 Lea Michele 1057 196 0 861 3 United States 75
21 +1 Jason Derulo 1031 910 1 122 0 United States 102
22 -1 David Guetta 1026 784 1 242 0 South Africa 101
23 -4 Ellie Goulding 1020 737 0 283 0 Ireland 105
24 -6 P!nk 1007 629 0 378 0 Philippines 112
25 -5 Lana Del Rey 989 562 0 427 0 Ireland 104
26 -2 Christina Aguilera 886 845 0 42 0 Canada 109
27 -2 Passenger 879 597 2 281 0 Canada 100
28 -5 Justin Timberlake 876 408 0 469 0 United States 110
29 -2 Bastille 823 548 0 275 0 United Kingdom 88
30 -1 A Great Big World 805 686 0 119 0 United Kingdom 96
31 -5 Stromae 795 522 0 273 0 Belgium 59
32 +2 Demi Lovato 774 659 0 115 0 Philippines 101
33 -3 Macklemore & Ryan Lewis 763 575 0 188 0 Austria 103
34 -3 Maroon 5 743 466 0 276 0 Philippines 101
35 -7 Lady Gaga 737 401 0 336 0 Spain 113
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http://kworb.net/itunes/
