This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

Mahol

1 Kings 4:31 View context

For he was wiser than all men; than Ethan the Ezrahite, and Heman, and Chalcol, and Darda, the sons of Mahol: and his fame was in all nations round about.

Zerah

1 Chronicles 2:6 View context

And the sons of Zerah; Zimri, and Ethan, and Heman, and Calcol, and Dara: five of them in all.

Joel

1 Chronicles 6:33 View context

And these [are] they that waited with their children. Of the sons of the Kohathites: Heman a singer, the son of Joel, the son of Shemuel,

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1 Chronicles 15:17 View context

So the Levites appointed Heman the son of Joel; and of his brethren, Asaph the son of Berechiah; and of the sons of Merari their brethren, Ethan the son of Kushaiah;