This is from a Playbill article. Don't know how accurate it is.
According to a statement by Lyric Stage music director Jay Dias, "When the show opened at the Broadway Theatre in 1959, Jule Styne had orchestrators Sid Ramin and Robert Ginzler use a string section that consisted of violins, cellos, and bass. After the initial Broadway run closed, the orchestration was adjusted to allow for theatres to use a more conventional string section division. For the Lyric Stage production, Jule Styne's estate and Sid Ramin himself have not only given permission for the original Gypsy cello parts to be restored, but an originally written acoustic guitar part, cut before the first rehearsal due to budget and seating capacity of the pit, will finally be heard. Lyric Stage's production will form the basis for the Jule Styne estate's work on the critical edition of the score, and it's quite a thrill that Lyric Stage audiences will soon be part of this major step in the restoration of one of the greatest scores in American musical theatre."
