Eyes closed, you'll swear you're at a live concert with Macy Gray, Johnny Cash, Garth Brooks, Neil Young, and Sammy Davis Jr. Open your eyes, and you're still not sure.

That's how Bob Byers, president, Tri-anim Health Services Inc., Sylmar, Calif., describes a show put on by corporate entertainer Greg London. “He's that good,” says Byers.

London is a man of many celebrity voices — more than 100, in fact. For the past 15 years, he has brought his musical and comedy extravaganza, “The Greg Show,” to corporations across the country, touring with a four-piece band and a trunkload of wigs, sunglasses, and outfits.

“If they don't like Neil Diamond, let's hope they like Ozzy Osbourne, and if they don't like Ozzy Osbourne, maybe they'll like David Bowie,” London says. “I write the show around the type of show the client wants, then I'll use the characters to deliver the message.” www.thegregshow.tv