A question about British culture
I don't know why some British musicians sing in American pronunciation. For example, at the beginning of 'drag me down' of One Direction, Harry sing 'I've got fire for a heart' in American pronunciation. Besides 'I've got' is a casual British expression. I mean some British sing in AP with British expression. I want them to sing in BP because I like British English.

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In music, it's all about what sounds best. Also, One Direction is more of a poppy, mainstream band, and singing in the American accent probably helps them sell records.

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It's happened for decades.  But not all bands and singers do it.  I recommend Madness, the Kinks, Squeeze, the Proclaimers, and Ed Sheeran, to start with.

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http://www.telegraph.co.uk/culture/music/rockandpopmusic/11720137/Why-you-put-on-an-American-accent-when-you-sing.html

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"Besides 'I've got' is a casual British expression."

No, not quite. It's very American as well. This is another of many myths about BrE vs. AmE.