Bon Jovi makes a big debut this week, but it's not enough to thwart the mighty Elvis. Also appearing: Tom Petty and the Stones. Hear them all now. music_chartwatching_1018.jpg 1 Chart Watching: 10/18 ffc055 http://smilparse.real.com/showcase/cliplists/1002/charts1018.ram 10336770352170 LAUNCH THE COUNTDOWN lock_icon.gif lock_icon.gif lock_icon.gif big_headline