MUSIC ROYALTY, ADVERTISERS TURN UP `SOURCE'S' VOLUME: JANN WENNER IS AMONG HOT MUSIC TITLE'S BIGGEST FANS 02.23.98 @ 12:00 AM ET MAGAZINES: ENTREPRENEURS FIND NEW SOURCE OF INSPIRATION: IN TODAY'S DOG-EAT-MAGAZINE WORLD, INDIE START-UP SUCCESS IS A RARE BREED 10.27.97 @ 12:00 AM ET