actually singers lke her have a very powerfull picth in the voice
jim morrison has the force in the graves katy perry and rihanna in the acutes
btw you should try also modern music
also you dont know how katy perry voice sounds like your speakers have "noise" supresion
this is real life man not movies, the only way to apreciate a singer voice is with cheap headphones
do you know that story about an unhappy king who was prescribed to heal the shirt of a happy man?
guess what ehn they found a happy man he used no shirt
edit:
try this:
get the cheapest headphones you can get which cover completely your ear and then tell me you dont like perry or rihanna, man those voices inspire owe but you need the right headphones