The idea was simple — but groundbreaking: Create a live showcase for black music, modeled on "American Bandstand."

Don Cornelius pulled $400 from his own pocket to launch the dance show on a local Chicago TV station in 1970. As host and executive producer of "Soul Train," he was soon at the throttle of a nationally syndicated television institution that was the first dance show to cater to the musical tastes of black teenagers and also helped bring black music, dance, fashion and style to mainstream America.

In the process of presenting the soul, funk and R&B of the day, the Afro-haired, dapper Cornelius became a TV icon, his sonorous baritone welcoming viewers to "the hippest trip in America."

Cornelius, 75, was pronounced dead at Cedars-Sinai Medical Center in Los Angeles Wednesday after a family member found him in his home in Encino with a gunshot wound to his head, according to law enforcement sources. The wound appeared to be self-inflicted, but the death was being investigated by police. Friends say he had been in poor health.

On Wednesday, those who knew Cornelius recalled his impact on American culture.

"Don was a visionary and giant in our business," producer and composer Quincy Jones said in a statement. "Before MTV there was 'Soul Train'; that will be the great legacy of Don Cornelius. His contributions to television, music and our culture as a whole will never be matched."

Aretha Franklin said Cornelius "united the young adult community single-handedly and globally."

"With the inception of 'Soul Train,' a young, progressive brother set the pace and worldwide standard for young aspiring African American men and entrepreneurs in TV — out of Chicago," Franklin, who appeared on the show, said in a statement. "He transcended barriers among young adults. They became one."

"Soul Train," which moved to Los Angeles and entered national syndication in 1971, featured other legendary artists, including James Brown, Marvin Gaye, the Jackson 5 and Barry White.

With its catchy introduction featuring an animated, psychedelic smoke-spewing locomotive, "Soul Train" became destination TV for teenagers across America in the '70s.

Magic Johnson was one of them. "Every Saturday morning I looked forward to watching 'Soul Train,' as did millions of other people," Johnson, chairman of Soul Train Holdings, said in a statement. "'Soul Train' taught the world how to dance! Don's contribution to us all is immeasurable."

Beyond the music and the artists featured on "Soul Train," much of its popularity was attributed to the young dancers on the show.

Cornelius' teen dance party featured the talents of some of the best young dancers in the area, and one of the show's most popular features was the "Soul Train" line, with dancers going down the line and showing off their best moves.

Among those who went on to later fame are actress Rosie Perez, singer Jody Watley, rapper MC Hammer and Jeffrey Daniel, who taught Michael Jackson how to moonwalk.

In his 1996 book "Funk: The Music, the People and the Rhythm of the One," Rickey Vincent called "Soul Train" the "most undiluted showcase of black sexuality in the country" and "a cultural mecca for the entire decade of the '70s."

That there was a need for such a show was obvious to Cornelius, who had launched his career in radio only a few years before the show's debut.

"It was a period when television was a very white medium, and that didn't make sense to me," he told Billboard magazine in 2005, the year he received the Trustees Award from the Recording Academy for lasting contributions to culture as the creator of "Soul Train."

"I wanted to bring more of our African American entertainment to not only the black [niche] viewers but to the crossover viewers as well," he said.

Robert Santelli, executive producer of the Grammy Museum in Los Angeles, told The Times on Wednesday that "'Soul Train' was to soul music what 'American Bandstand' was to early rock 'n' roll, and Don Cornelius was like a black Dick Clark.