The majority of my favorite artists are Female, not that they are explicitly better content wise, it's just that I find the Female voice much more attractive. So basically I'm attracted to certain songs, and that's just nature I suppose.
Honestly though, to state my favorite would be incredibly difficult because I listen to so much music that there is always something new and exciting.
I'd have to say I heard this for the first time yesterday and it kind of blew me away. Lyrical content matters a great deal, but the key these days is whether or not a lot of said pop stars can sing live.
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Incredibly surprised nobody said Adele because that girl can sing like no other, albeit probably too mainstream for you hipsters (although I bet I'm the biggest hipster in here).