NEW YORK -- One of musical theater's most exciting new writing partnerships started with a breakup song.Composer Burt Bacharach and lyricist Steven Sater bonded while creating “Ready to Be Done With You,” cementing a collaboration that has now produced a 13-track concept album sung by some of Broadway's best.“It's just been a thrill ride for me and the thrill of a lifetime to work with Burt,” says Sater, the Tony-, Olivier- and Grammy-winner behind “Spring Awakening,” which paired his story and