Barbra Streisand’s Columbia Records release “Back to Broadway” will debut at No. 1 on Billboard’s pop album chart next week, displacing Janet Jackson’s premiere Virgin Records disc, “janet.,” after its six-week stay at the top. The album, Streisand’s 44th charting album for the Sony Music-owned label, was released June 29.With a claimed advance order of 1 million units, the album is Streisand’s first to reach No. 1 since 1985′s “The Broadway Album,” which peaked for three weeks. “Back to Broadway” is the seventh album in her career to top Billboard’s pop chart; her first to debut at No. 1; and her first album of new material since 1988′s platinum-certified “Till I Loved You,” which reached No. 10. The second-highest debut on Billboard’s pop chart next week is Billy Idol’s Chrysalis release “Cyberpunk,” at No. 48. Billy Ray Cyrus’ “This Won’t Be the Last,” released by Polygram/Mercury one week before “Back to Broadway,” is No. 3 in its second week on the chart. The next-highest-charting adult contemporary album after “Back to Broadway” is the soundtrack to “Sleepless in Seattle,” at No. 9 after two weeks. In its third charting week, Natalie Cole’s “Take a Look” is No. 30, after peaking last week at No. 26. The major threat to Streisand’s chart-topping position is U2′s “Zooropa,” released by Island Records this week.