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Allegedly the One Direction boy band is not seeing eye to eye all because of Harry Styles' urge to shift from pop to rock 'n' roll.






According to an insider, Styles is ready for his 1D crooners to elevate to the next level in the music industry as men.






"Harry loves being in the band and respects and loves his bandmates. But he's very ambitious and thinks they should be growing up more and becoming more credible," said the source to the Daily Star.






Their newest album, "Midnight Memories," isn't as pop as their prior work. However, Styles wants to supposedly thrust One Direction more into the rock genre.






"Their third album Midnight Memories was already a lot less pop but Harry wants to push it further," said the source. "He thinks their next album is the perfect time to create a much edgier and more rock 'n' roll image and he's already writing songs that he wants them to include on the record."






Reportedly, hanging out with legends like Elton John, The Rolling Stones, and Rod Stewart is what influenced Styles to want to head into the rock realm.






However, according to the source, this is not going over well with the rest of the band.






"The problem is the rest of the band fear if Harry starts changing their style he's going to take over the whole thing," said the source. "Niall and Louis especially are worried about turning their backs on a pop sound and changing a winning formula. The fear is that if Harry doesn't get his way he could end up walking out and going solo."