When Eric Steinberg went to a local club with a friend last summer to listen to music, he says, he was "pretty used to being apathetic."

But the club specialized in antiapartheid music, and the message got to Steinberg. And he has spent much of his spare time since then organizing and promoting "Rock Against Apartheid," a fund-raising concert planned for tomorrow night at Lisner Auditorium.

Steinberg, 16, a Bethesda resident who is a junior at Walt Whitman High School, describes opposition to South African apartheid as "a cause that is so obvious" in response to "an injustice that is blatant."

Profits from the concert will go to the Africa Fund, a nonprofit organization that uses money for antiapartheid education programs and aid to political prisoners in South Africa.

A committee of Whitman students and representatives from about 20 Montgomery County and District high schools have helped Steinberg publicize the benefit, sell tickets and order T-shirts to be sold at the concert.

"I think a lot of kids my age want to be involved," Steinberg said.

Steinberg said the benefit performers -- Marginal Man, Government Issue, Slickee Boys, The Newkeys and Carl Malcolm and the Positive Vibration Band -- Steinberg said they should appeal to tastes from new wave to punk to reggae.

Admission to the 8 p.m. concert is $7. Tickets are sold at high schools in Montgomery County and the District, at Lisner and at area record stores.