I have a habit of watching in series a number of versions of a particular song that has come to mind. Watched a bunch of Friend of the Devil the other day, one of which was video of the original Dead, with Ron McKernan. Google told me that he too is a member of the 27 Club. Further googling indicates that 2.2% of popular (whatever that meant to the compiler) musicians die at 56 (highest correspondence), while only 1.3 % die at 27. Spikes also occur at 25 and 32. So much for boomer mythology.
Bob