The soft music of the O'Jays permeates the Imperial Ballroom at Trump Plaza. A boxer in black trunks dances around the ring throwing punches at imaginary targets.

In a far corner of the ballroom, another boxer in black trunks is creating music of his own. The sound is unmistakably that of heavyweight champion Mike Tyson.You hear whacks and thuds as the heavy bag hanging from a bar twists and turns from the hooks and jabs that Tyson throws at the behest of trainer Kevin Rooney.

A man stands on a chair and holds up a microphone to record the thumps and whacks. Cameramen have only a few minutes to provide a picture to accompany those sounds.

When you see the picture and hear the thuds in your living room, you will wonder how anyone could withstand the power that makes a heavy bag swing as easily as chimes in a breeze. Tyson looks as invincible as his 34-0 record.

But wait until you see him in two years, Rooney says.

"He has improved about 50 percent in the last year," Rooney said. "He's a much better fighter now.

"But you haven't seen the Mike Tyson that will really excite people. You haven't seen him at 100 percent. At least every day he will show in one round what he is capable of doing for 15 or 20 rounds. I expect in two years he will be fighting that way consistently."

It is a chilling forecast that stirs the imagination.

Will this new, improved, already invincible man literally knock the stuffing out of a heavy bag? Or another heavyweight?

"If he fights for a long time, I think he will break every record in boxing," Rooney said.

In a hotel room on the 27th floor of Trump Plaza, another invincible fighter who was going to break every record in boxing extends his legs from a chair that looks too small to accommodate him. His arms are large enough to still play their own tune on a heavy bag.

He has won nine straight fights. He is jocular, amicable and articulate.

But how could anyone believe that he is going to regain the heavyweight championship he lost in another decade? George Foreman is 40 years old, his comeback has included unranked and unknown fighters, and he is many years removed from invincibility.

"I remember when I was 14 years old listening to people talk about Sonny Liston," Foreman said. "When you mentioned Sonny Liston's name in a room, people trembled. He was going to kill Cassius Clay.

"I lived through that era. After that, it was Muhammad Ali. Nobody could whip him. Then, along came Joe Frazier.

"Every man can get whipped."

Foreman did not believe that when he fought Ali in Zaire in 1974. Now a minister, Foreman was then a devout believer in the punching power of George Foreman.

"You were always told to hit somebody on the chin to knock them out," he said. "So one day, I decided to try something.

"I hit a guy right on top of the head. I could feel my fist sink inside him. It was like cutting a cake. You feel the knife just slide in, and you know it's in."

The fighter dropped to the canvas, and Foreman reveled in his own power. "I'm the hardest hitting fighter in the world," he boasted. "Because I can knock people out where they can't be knocked out."

But when he could not knock out Ali, he was mystified. He would wake up at night sweating, wondering how he fell and Ali didn't.

Liston probably suffered as many sleepless nights after Ali hit him with punches he could not see or withstand. And perhaps, somewhere there is a fighter capable of puncturing Tyson's seemingly invincible armor.

Foreman says Spinks is not that fighter. He says it will take an older guy, a heavier guy, a guy who can make Tyson run.