Saturday, April 5, is a solemn day for fans of grunge music. The date represents the tragic passing of two of the genre’s most revered voices: Nirvana’s Kurt Cobain and Alice In Chains’s Layne Staley. Although the singers passed from different causes – Cobain from suicide in 1994 and Staley from an overdose in 2002 – both deaths were a result of lives tormented with depression, isolation and substance abuse, themes they didn’t shy away from in their music.