 Jacob found himself working for two famous choreographers in 1975, starting with Fosse calling him to fix some audio problems "Chicago" was having during tryouts in Philadelphia, then with Michael Bennett who needed advice about how the offstage band would work in "A Chorus Line".Jacob bounced between Philadelphia and New York for six weeks.To help "Chicago" he placed a wireless lavalier microphone in the wig of Gwen Verdon, as she was dancing in a tight-fitting bustier, and the wireless bodypack was too visible anywhere else.