Everyone has a guilty pleasure when it comes to TV shows, whether it be an 'uncool' TV talent contest or a "cooking doesn't tougher than this" cooking programme.
But for millions of people around the world there's only one that really stands head and shoulders above the rest: Glee.
Since it launched last year, the programme, which tells the story of the fictional high school glee club New Directions, has become a global phenomenon.
And due to its reliance on music, Glee has also become a surprising hit with some of the world's biggest music stars.
So as season two kicks off, Gigwise has taken a look at some of Glee's most notable musical hook-ups.
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