Even the most mediocre reality shows teach us something. And the new reality series “Gone Country” (7 p.m., CMT) offers at least four lessons in its seven episodes.

First off, it seems that the gods of Nashville are mighty desperate. Why else would Big and Rich star John Rich invite a motley crew of talents to audition as country crooners? “Gone” features New Edition veteran and reality-TV train wreck Bobby Brown, pop princess Carnie Wilson, shock rocker Dee Snider, one-hit wonder Sisqo, “Idol” runner-up Diana DeGarmo, singer Julio Iglesias Jr. and Marcia Brady herself, Maureen McCormick.

Our second lesson teaches us that CMT, a minor province in the kingdom of Viacom, is beginning to look more and more like its corporate cousins. Have you noticed how much TVLand now resembles VH1, which resembles MTV, which resembles CMT? To accentuate this point, “Gone Country” repeats on MTV2 at 8 p.m., between repeat episodes of “Punk’d” and “Jackass.”

We also learn that the best way to get cast for a reality show is to have been on another reality show. Nearly everyone here has other reality shows on their resume, from “Being Bobby Brown” to “Celebrity Duets” (Snider) to “American Idol” (DeGarmo). Both Wilson and McCormick appeared on “Celebrity Fit Club.” A veteran of Spanish-language television, young Iglesias’ credits also include something called “Celebrity Paranormal Project.” Now that’s a title with potential.

Finally, we learn that reality-TV shows no longer require a concept or even a title. We really don’t care whether McCormick can sing country or sing at all. The whole point is to put a mismatched group of has-beens together on a bus and watch them mingle or bicker. It could be “Celebrity Badminton” or “Celebrity Pillow Fight” for all we care.

For the record, McCormick provides the oddest moments, at least during the first episode. It’s not that she misbehaves. She simply exudes a childlike enthusiasm for practically everybody and everything. Snider wonders whether she should be “medicated.”

He’s one to talk, as he grows increasingly agitated in a caffeine-free environment. Addiction looms large in other ways. Brown and McCormick form a tight, flirtatious alliance as the only would-be country stars with nicotine cravings. This may not be Nashville, but at least two players still live in Marlboro country.

¢ Speaking of country music (and Viacom), CBS will broadcast “Garth Brooks: Live in LA” (8 p.m., CBS), one of five shows Brooks has scheduled over a two-day period. All proceeds will go to charity.

Viacom isn’t the only mega-huge media corporation guilty of shameless synergy. NBC-Universal (NBC, USA, Sci Fi, Bravo, Oxygen, etc.) has been going out of its way to tout its connection to Telemundo. Nely Galan, a former executive for that Spanish-language network, has loomed large on “Celebrity Apprentice” despite The Donald’s clear intentions to shout “You’re fired!” in her general direction.

¢ On tonight’s episode of “Psych” (9 p.m., USA), Shawn and Gus investigate a murder mystery on the set of a popular Telemundo telenovela.

¢ The contestants face final challenges before the big pageant on “Miss America: Reality Check” (9 p.m., TLC).

Tonight’s other highlights

¢ A student’s fears induce a coma on “Ghost Whisperer” (7 p.m., CBS).

¢ Neighbors take on eyesores on “The Ugliest House on the Block” (7 p.m., 8 p.m. and 9 p.m., WE). The first is a repeat.

¢ After the incident at the movies, Smash faces charges on “Friday Night Lights” (8 p.m., NBC).