They're four of the biggest bands of the 1960s. But they often relied on songwriters not in the group for their material.

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FILE - Chuck Negron, former lead singer of Three Dog Night, sings to a crowd during a Christmas Eve party, Dec. 24, 1997, at the Union Rescue Mission in Los Angeles. (AP Photo/John Hayes, File) NEW ...

ap photo Chuck Negron sings to a crowd during a Christmas Eve party, Dec. 24, 1997, at the Union Rescue Mission in Los Angeles. NEW YORK — Chuck Negron, a founding member of the soul-rock sensations ...

NEW YORK (AP) — Chuck Negron, a founding member of the soul-rock sensations Three Dog Night who sang lead on such hits as “One” and “Just an Old Fashioned Love Song” and hollered the immortal opening ...

Chuck Negron, a founding member of the soul-rock sensations Three Dog Night who sang lead on such hits as "One" and "Just an Old Fashioned Love Song" and hollered the immortal opening line "Jeremiah ...