Mr. Z. was also able to speak and breathe normally following his surgery.

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Hatfill also criticized Nicholas Kristof, a New York Times columnist, who referred to the scientist as "Mr. Z" and criticized the FBI for not pursuing him more aggressively.

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Mr. JAY-Z: (Rapping) From standing on the corners bopping to driving some of the hottest cars New York has ever seen.

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Mr. JAY-Z (Rapper): (Rapping) You can't even drink Cristal (unintelligible).

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Mr. Behnam prefers tunes from Jay Z, A Flock of Seagulls and Led Zeppelin.

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Only letters that are used more than 80% of the time are shown, and the rest of the keys are hidden to keep the user experience crisp, Mr. Ghassabian said. (The Z key is the least-frequently used, followed closely by the X key.) He says the system is up to three times faster than a traditional keyboard.

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For the final round, Mr. Kurtis said players would have to form the letter "Z" on their cards, in honor of Madame ZuZu's.

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Mr. KENNEDY: They're not exactly Nas and Jay-Z.

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"Nostalgia, Ultra" made a big splash online, reinvigorating Def Jam's interest in Mr. Ocean and leading to his contribution of vocals for an album by Kanye West and Jay-Z.

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