It seems that my grandparents were right about pop music, it does all sound the same (at least at the moment).
Exhibit A: Lady Gaga’s ‘Born This Way’ vs Madonna’s ‘Express Yourself’
Exhibit B: Jessie J’s ‘Price Tag’ vs Leona Lewis’s ‘Better In Time’
Exhibit C: Katy Perry’s ‘Firework’ vs Alexis Jordan’s ‘Good Girl‘
In fact, it’s almost typical of pop music to copy/homage/rip-off/take influence from other songs, you only have to listen to this to realise why: