Last Friday's rumors about Radiohead's concert for the Occupy Wall Street protestors turned out to be a hoax, but the megaphone-wielding inhabitants of New York's Zuccotti Park received an even bigger surprise performance last night courtesy of enigmatic Neutral Milk Hotel singer Jeff Mangum. Armed only with his acoustic guitar and the same sweater he's been wearing for over a decade, Mangum sang six tracks off In the Aeroplane Over the Sea, an earlier NMH cut called "Song Against Sex," and a cover of Minutemen's "Themselves."

Mangum played this past weekend at All Tomorrow's Parties' I'll Be Your Mirror fest and has more tri-state area shows scheduled next month, so the impromptu performance wasn't completely out of the blue (compared to say, his hiatus-ending gig at a Brooklyn loft last year). He certainly had plenty of fans in the Wall Street crowd as each Aeroplane track, especially "Oh, Comely" and "Two-Headed Boy Part 2," turned into a sing-along. Hopefully, Fox News wasn't on

Just hours after Rihanna dismissed rumors that her next album is called I'm Sexy and I Know It (phew), the prolific pop star revealed the LP's true title to people that "like" her on Facebook. Talk That Talk, Riri's sixth album in seven years, is due out November 21st, the Monday before the dreaded Black Friday. There's usually a meaning behind Rihanna's album titles -- 2009's Rated R reflected the singer's serious, no-holds-barred mindset following the Chris Brown incident -- so TTT is probably a response to all the nonsense the tabloid press writes about her. As huge fans of Talk Talk, The Amp approves of anything that also uses the word twice in one sentence.

[Photo: Ian Gavan/Getty Images]

Pop stars rarely herald comebacks with acknowledgements that they've been gone long enough to warrant a comeback, but '80s pop star Martika has been out of the spotlight for so many years, she kind of had to say it. "I'm officially coming back with new material," she announced in a new video blog posted on Perez Hiton's site today, mentioning an album is in the works along with a 2012 tour. She did make one tactical error -- she asked fans to join her "Toy Soldier Army," evidently what she's decided to name her fans. Too soon, Martika. And that branch of the pop military doesn't sound like much of a match for the Rihanna Navy.

But, hey, Martika is coming back! If you don't remember her 1989 Number One hit "Toy Soldiers," you did not exchange any friendship bracelets for mixtapes with your camp buddies that year. Eminem sampled the track on 2004's "Like Toy Soldiers," too. Also important to know: Martika was on Kids Incorporated with Fergie.

Why come back now? Why not -- a quick

If a new show absolutely must join the already jam-packed lineup of reality-singing competitions on the airwaves, at least it's a series where contestants will be in physical peril for our amusement. Deadline reports that TruTV is jumping into a field crowded with American Idol, The Voice, The X Factor, The Sing-Off, Karaoke Battle USA, and lord knows what else with Killer Karaoke, a take-off of a British show called Sing If You Can. It's hard to get excited about yet another hour of Journey covers during prime time, but this helps: It's "described as the Wipeout of singing competitions" where contestants try "to sing a hit song while being put through extreme, wild and unexpected physical challenges."

Go on, we're listening.

The original series has featured challenges like "performing a song from a specially designed erupting volcano and doing a solo while having one's chest waxed." This sounds like a job for a Jackass, and fittingly Steve-O has been tapped to host Killer Karaoke.