Here are 2 famous musicians from United States of America died at 30:
Sylvia Plath (October 27, 1932 Jamaica Plain-February 11, 1963 London) otherwise known as Plath, Sylvia was an American poet, writer, novelist and author. She had two children, Nicholas Hughes and Frieda Hughes.
She died as a result of suicide.
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Robert E. Howard (January 22, 1906 Peaster-June 11, 1936 Cross Plains) a.k.a. Robert Ervin Howard, Patrick Ervin or Robert Howard was an American writer, novelist and author.
He died caused by firearm.
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