Two very different musical genres get primetime showcases tonight. Brooks & Dunn hosts the 39th annual Country Music Association Awards (7 p.m., CBS). Over on UPN, Tracee Ellis Ross and Anthony Anderson take the helm at the Vibe Music Awards (7 p.m., UPN). Hip-hop and country don’t often mix, but both awards shows are being broadcast on networks owned by Viacom.

While the CMA awards will be broadcast live from Madison Square Garden in New York, the Vibe event, honoring the best and most innovative in urban music, was taped last Saturday in Los Angeles. The Manhattan venue for the CMA makes for an interesting pop culture clash and a city showcase for country style.

Brad Paisley and Lee Ann Womack lead tonight’s pack with six CMA nominations apiece. Scheduled performers at the Garden include Dierks Bentley, Big & Rich, Bon Jovi, Kenny Chesney, Sara Evans, Rascal Flatts, Faith Hill and others. The announced performers at the Vibe Awards are Ciara, Ludacris, Pharrell and Young Jeezy.

Tonight’s other highlights

¢ Joy makes it a point to exclude Earl from her wedding to Darnell on “My Name is Earl” (8 p.m., NBC). In fact, her invitation to Randy specifically states that he can bring “anyone but Earl.” And as if to rub salt in his wounds, she schedules her big day on his birthday and invites all of his friends, so he’ll have no one to blow out the candles with.

¢ A disco hides mummified remains on “Bones” (7 p.m., Fox).

¢ “Nova” (7 p.m., PBS, check local listings) profiles Sir Isaac Newton.

¢ A cyclist’s drug use exposed on “House” (8 p.m., Fox).

¢ New directions and controversial appointments on “Commander in Chief” (8 p.m., ABC).

¢ “Las Vegas: An Unconventional History” concludes on “American Experience” (8 p.m., PBS, check local listings).

¢ An innocent (Brendan Fraser) raised in a fallout shelter since 1962 emerges in a sordid City of Angels in the 1999 comedy “Blast from the Past” (9:10 p.m., TBS).

¢ Steve Martin, recipient of the 2005 Mark Twain prize, stars in the title role of the 1979 comedy “The Jerk” (7 p.m., AMC).