BORN on the fourth of July? No problem - FM3 will be reborn tomorrow night as an all-night radio station featuring US music of all kinds from smoky jazz to music theatre to a bit of Bernstein and Barber. It's the station's first all-night marathon and will offer listeners a sneak preview of what's in store when FM3 finally extends its broadcasting hours. The evening kicks off at 7.30 p.m. with an introductory look at the world of American music from Donald Helme; that's followed by James Conway's selection from the musicals, All Singin' All Dancin', at 8.30 p.m. At 9.30 p.m. there's a relay of the Friday night concert from the National Conceit Hall, and at 11 p.m. a live session with jazz masters Honor Heffernan and Louis Stewart, plus much more...