VITAL NOTES FROM NEW YORK PUBLICISTS--From Maxim Gershunoff, a note that the author of the various "Hite Reports," Shere Hite, is marrying "22-year-old classical pianist Fred Horicke in New York Oct. 19 . . . (he) was considered a prodigy at the Cologne Conservatory, where he began his studies at an unusually early age." And, from Bobby Zarem, the clearing up of what he believes is a "misconception about the origins of the Hard Rock" (the New York and London restaurants). He wants everyone to know that Isaac Tigrett "had the concept for the original Hard Rock Cafe, which opened in London in 1970" and has "donated--actually donated--in excess of $300,000 to Live Aid."