Membership in the so-called '27 Club,' made up of music stars who tragically died at that age, continues to grow -- making it difficult to keep up with this historical oddity. Whether by misadventure, accidental or violent means, a striking number of very famous people met their end on the wrong side of 30.

Watch the video above to learn more about this group. From Jimi Hendrix and Janis Joplin during rock's paisley age to next-gen figures like Kurt Cobain and Amy Winehouse, they are bound then as now by tragedy and a fateful age.

In some cases, as with Brian Jones, early bluesman Robert Johnson and Jim Morrison, much intrigue remains. For others, like Badfinger's Pete Ham, their sad endings seemed to be a culmination of life's ceaseless pressures.

But why then? What is so special about 27? Researchers with the Centre for Public Health at Liverpool John Moores University have been studying this troubling trend, and they've found some fascinating commonalities.

Find out more about who is part of the '27 Club,' and how they earned that membership on this latest edition of our 'You Think You Know Classic Rock?' series.

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