Selena Gomez soars from No. 24 to No. 1 on the Billboard Artist 100 chart (dated Jan. 25) to become the top musical act in the U.S. for the first time, as the pop superstar's new LP Rare arrives at No. 1 on the Billboard 200 with112,000 equivalent album units, according to Nielsen Music. Gomez also lands three songs from the album on the la