It's a position most pop stars would give their eye-teeth to be in, but for some acts, having a huge-selling album can be a bit of a burden.
Oh, sure, you've been in the Official Albums Chart for 170 weeks, but in the back of their minds the mantra: 'How do I follow this one?!' grows louder.
For some stars, chucking out another smash hasn't been a problem at all - Dua Lipa, J Hus and George Ezra are recent examples of artists swerving the "difficult second album" myth.
But some hit albums are so unique, such a one-off, successive releases can't help but be eclipsed by them. We look back at acts who scored massive albums that, so far, they haven't been able to match.
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