The already thin line between advertising and pop music will be further frayed when Britain's outrageous postconceptualist band Sigue Sigue Sputnik releases its debut album next month. The appropriately titled "Flaunt It" will carry paid advertisements in the space between songs (with German and Japanese spots in those markets). The spots will be up to 30 seconds long. According to manager Tony James, two magazines, a video game manufacturer and a clothing retailer have already bought half the eight spots, which are priced at $1,500 apiece.

The band, whose philosophy can be summed up as "the higher the hair, the higher the heels, the higher the income," reportedly had to negotiate with its record company, EMI, over who actually owned the heretofore silent gaps between songs (they've settled on a 50-50 split). The band also claimed that this will allow it to lower the price of its albums -- sometime in the future.

Actually, this opens up great possibilities: For instance, the Parents Music Resource Center could buy spots on the next Twisted Sister and Ozzy Osbourne records. Then again, Bob Guccione could arrange for spots on the next Amy Grant album. Will Ike buy some public service announcements on the next Tina Turner record? Who'll sponsor the Cars -- Ford or Chrysler? Stay tuned. Tie Another Yellow Ribbon

More than a year after their father was seized in Beirut, Eric and Paul Jacobsen have put out "When the Word Comes," a record that describes their father's plight. David Jacobsen, 55, administrator of the American University Hospital in Beirut, is believed to be held by the extremist group Islamic Jihad, or Islamic Holy War.

"We want something out there every day to remind people" about the hostages, Eric Jacobsen said on NBC's "Today" show, "and to hopefully generate a supportive response. It would be nice of the captors if my father and these other hostages could hear it also."

The song, a pop ballad, has been sent to adult contemporary radio stations, and it may later be distributed to country stations. The single, on the MCA-Curb label, was shipped last week to record distributors across the country. "In our effort to promote my father's freedom, I guess we have to get out and promote" it, says Eric Jacobsen. "We don't really know what's going to work, and until something happens, and these guys are on the plane and on the way home, there's really no reason to get too optimistic," Paul Jacobsen said when asked about recent efforts to free the hostages.

Eric Jacobsen, who has performed nonprofessionally in the past, sings the song with help from studio musicians. The chorus ends: "When the word comes/ And we'll be done/ Waiting and praying for the day/ When we're finally one."

Any profits will go to the National Organization for Victims' Assistance for a fund for the hostages' families. Heavy Metal Blues

Vince Neil, lead singer with the heavy metal band Mo tley Cru e, surrendered in Torrance, Calif., Monday to begin serving a 30-day county jail term for vehicular manslaughter, but the start of his term was delayed until July 14 so he can serve his time in the Gardena City Jail.

Neil, 24, pleaded guilty last July to vehicular manslaughter and drunken-driving charges stemming from a 1984 collision that killed the drummer of the defunct Finnish group Hanoi Rocks. He was sentenced to the jail term last September and was also ordered by Superior Court Judge Edward Hinz Jr. to pay $2.6 million restitution to two people injured in the car crash and to the estate of the deceased drummer, Nicholas Dingley, 24.

And in Long Beach, a weekend Ozzy Osbourne concert series ended uneventfully after one fan plunged to his death from the bleachers in an earlier show at the Long Beach Convention Center. John Loftus, 22, of Newbury Park, Calif., died Saturday of a broken neck. According to police reports, three people were seriously injured in falls from the bleachers Saturday, and as many as 50 people were treated for minor injuries. The frenzy began as warmup group Metallica was finishing its set, said George Morgan, the fire battalion chief.

* An unidentified man who was treated for minor injuries and released told doctors he jumped from a bridge because he was upset at the theft of his tickets to the concert.

*Osbourne, a former member of the group Black Sabbath, said through his publicist Michael Jensen that he believed the incidents Saturday were drug-related. "He Osbourne said he doesn't go on stage drunk or stoned and he hopes his audience wouldn't do it either," Jensen said. Osbourne's attorney, Howard Weitzman, said ambulances arrived a full 25 minutes before the singer was scheduled to begin performing.

Osbourne was sued in January by parents who claimed his album "Speak of the Devil" was a factor in their son's suicide. The parents of John Daniel McCollum cited the songs "Suicide Solution" and "Paranoic."