Wikipedia : 27 Club

The 27 Club, also occasionally known as the Forever 27 Club or the Club 27, is a popular culture name for a group of influential rock and blues musicians who all died at the age of 27, sometimes under mysterious circumstances.

Name	Cause of death	Fame
Brian Jones	Drowned in swimming pool.	Rolling Stones founder and guitarist / multi-instrumentalist.
Jimi Hendrix	Asphyxiated on vomit after overdose of sleeping pills.	Pioneering electric guitarist, singer and songwriter for The Jimi Hendrix Experience and Band of Gypsys.
Janis Joplin	Probable heroin overdose.	Lead vocalist and songwriter for Big Brother and the Holding Company, The Kozmic Blues Band and Full Tilt Boogie Band.
Jim Morrison	Official cause of death listed as "heart failure", however, no autopsy was performed.	Poet, lead singer, songwriter and video director for The Doors.
Kurt Cobain	Officially ruled a suicide by shotgun.	Lead singer, guitarist and songwriter for Nirvana.

via : wikipedia/27 club