4 Beck
7 a-ha
10 John Newman
13 Leona Lewis
14 Nate Ruess
16 Echosmith
18 ZZ Ward
21 Maroon 5
22 Pentatonix
24 Daya
25 Simply Red
26 P!nk
27 Karmin
28 Hozier
29 Andy Grammer
30 Taylor Swift
31 Mika
32 Rob Thomas
34 Sia
35 Oh Honey
39 Muse