"If you looked into the face of a mother whose daughter or son has died in their arms for no good reason, they don't know of care who's President of America. It's something that once you're a witness to, you can't get it out of your head."
- Bono, 2009
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Many musicians have been influenced by the work of U2. There are several cover versions of U2 songs by bands such as Pet Shop Boys, Pearl Jam and The Chimes, and musicians such as Cassandra Wilson, Joe Cocker and Johnny Cash.