Van Halen, Usher also among RIAA May certs.

Norah Jones' sophomore Blue Note release, "Feels Like Home," was certified quadruple platinum by the RIAA in May for shipments of 4 million units. Jones' debut, "Come Away With Me," has been certified nine-times platinum by the trade body.

Fellow Grammy-winning R&B songstress Alicia Keys added another million units to her sophomore release, "The Diary of Alicia Keys" (J), in May, for a triple platinum tally. Her 2001 debut, "Songs in A Minor," has been certified for 6 million units.

May was also a boon for the Van Halen catalog. Each of the following Warner Bros. albums added 1 million shipments: "5150," "OU812," "Balance," "Van Halen II" and "The Best Of, Vol. I." The rock legends -- who are preparing for a North American summer tour -- boast a career shipment total of more than 55 million units.

After an eight-week stint atop The Billboard 200, Usher's "Confessions" (LaFace) was certified quadruple platinum, tying his previous release, "8701." His 1997 debut, "My Way," remains his biggest title, with more than 6 million units shipped.

Also in May, Janet Jackson earned the seventh platinum album of her career with "Damita Jo" (Virgin), while rock newcomers Jet and Switchfoot were awarded their first platinum honors for "Get Born" (Elektra) and "Beautiful Letdown" (Sparrow), respectively.