When East Germans began flocking across the crumbled Berlin Wall during the first weeks of freedom, sales of champagne and fresh fruit were brisk. Recently, their purchase of choice has been recorded music. In fact, business in West Berlin record shops is up 300 percent.

But are these fledgling yuppies buying Wagner or Beethoven discs?Nein!

The top-selling recordings have been the "Dirty Dancing" soundtrack and AC/DC.

So it seems that after 15 years of cultivating an outrageous "bad schoolboy" image, Angus Young and his controversial rock band, AC/DC, are very much alive and doing well . . . internationally.

Even U.S. intelligence forces chose the ear-splitting "kings of volume" to flush Panamanian dictator Noriega from his lair. Their ammunition: blasts of prime AC/DC music.

AC/DC has rung eardrums ever since the heavy metal band was formed in Australia in the mid-'70s. A hell-raising bravado and driving, hard-rocking sound pushed the group to the top of the American charts with the "Highway to Hell" album in 1979.

The album excited rebellious teens and dismayed parents with anti-establishment lyrics aimed at "proper" society.

Lyrics such as . . . "If good's on the left . . . then I'll stick to the right . . ." kept the "Thunder from Down Under" in the press, vigorously attacked by fearful parents and religious leaders as a corrupting influence.

The 1980 death of AC/DC vocalist Bon Scott (who died in a drunken stupor after a notoriously excessive lifestyle) only seemed to enhance AC/DC's popularity.

The grimacing devil-horned LP cover photo of Angus Young packed a heavy punch with the junior high to high school, predominately male, fans. They, like their parents (who had reacted similarly to Elvis' gyrations), had a vehicle with which to widen the generation gap . . . while making millions for the group.

And the band isn't about to do anything to damage the outcast image that ties it so closely to its loyal audience.

Although the lineup of band members has been shuffled over the years, the sound has basically remained intact.

After a three-year recording void and various personal problems, AC/DC recently released "The Razors Edge," currently lodged in Billboard's Top 10 album chart.

Brothers Angus (bad boy, lead guitar) and Malcom (rhythm guitar) Young were part of the original band; lead vocalist and lyricist Brian Johnson is backed by Cliff Williams (bass guitar) and newest addition Chris Slade (formerly of The Firm).

Friday night's 7:30 p.m. concert will be another showcase for Angus Young's antics and the sturdiness of the Salt Palace sound system.

And an audiologist's nightmare.

The opening act for AC/DC is King's X, a three-member band with an eclectic blend of classic, contemporary and futuristic rock sounds.

King's X has established a loyal following since touring with such notables as Robert Plant, Cheap Trick and Blue Oyster Cult.

A video from the group's third album, "Faith Hope Love," is currently featured on MTV.

Tickets for AC/DC-King's X can be purchased at all Smith'sTix outlets, the Salt Palace and the Huntsman Center. To charge by phone, call 467-5996.