The top hard rock and metal stories from Loudwire and around the web for April 21, 2014:

Duff McKagan to Join Guns N' Roses at Revolver Golden Gods, Suicide Silence Added to Bill: [Loudwire]

- Joey Jordison's Scar the Martyr Open Vocalist Auditions to the Public: [Loudwire]

- 10 Best Korn Songs: [Loudwire]

- Nirvana Tribute Album 'In Utero: In Tribute' Streaming in Full: [Loudwire]

- Green Day's Billie Joe Armstrong Joins Replacements at Coachella 2014: [Loudwire]

- Machine Head Stream New Song 'Killers & Kings' + Cover of Ignite's 'Our Darkest Days/Bleeding': [Loudwire]

Wovenwar Unleash Debut Single, 'All Rise': [Loudwire]

Alice in Chains Expand 2014 North American Tour With August Dates: [Loudwire]

Black Label Society's Zakk Wylde on 'Catacombs of the Black Vatican,' Meeting Ozzy Osbourne + More: [Loudwire]

Cynic's Paul Masvidal Talks 'Kindly Bent to Free Us' Album, Sci-Fi Fascination + More: [Loudwire]

Delain's Charlotte Wessels Talks New Album 'The Human Contradiction' + More: [Loudwire]

De La Tierra's Andreas Kisser Talks Debut Album, Touring + More: [Loudwire]

- Vital Vinyl: BL'AST! Frontman Cliff Dinsmore Discusses Influences, Reissues + The Future: [Loudwire]

- Read Iggy Pop's Heartfelt Letter to Fan: [Ultimate Classic Rock]

Deep Purple Expected to Draw 100,000 for Controversial Concert: [Ultimate Classic Rock]

- Gravy Train? Ozzy Osbourne Ranks High on 'Hardest Lyrics to Understand' Poll: [Ultimate Classic Rock]