In a week full of strong debuts, from Lyfe Jennings and Def Leppard to the Roots and Portishead, Madge is No. 1.It's a busy week at the top of the The Billboard 200, with Madonna's Hard Candy leading the action at No. 1. It is the artist's seventh chart-topper, the second-most among all female artists--only Barbra Streisand, with eight, has more. The Warner Bros. set moved 280,000 copies, according to Nielsen SoundScan. After racing 68-3 last month, the diva's single "4 Minutes" featuring Justin Timberlake gave Madonna her 37th top 10 hit--the most of any artist in the rock era. Until now, she and Elvis Presley were tied with 36 apiece. As a consequence, Mariah Carey's E=MC2 (Island Def Jam) is dethroned to No. 2 after two weeks on top; the album moved 95,000 units, a 48 percent sales drop-off. Leona Lewis' Spirit (Syco/J) slips 2-3 with 84,000 (-12 percent).Lyfe Jennings' Columbia album Lyfe Change starts with 80,000 at No. 4. His last set trumps this start though, as The Phoenix began at No. 2 with 136,000 in 2006.