Only the first title should be converted to from sort to display order. Subtitles don't influence display order, so don't need to be touched. OK, I now have a subtitle with a comma ('Ring the Bell, Watchman'). If it was the main title I'd have to do something else, but it isn't, so for now...

X: 1
T: Balance the Straw
A: Fieldtown
M: 6/8
L: 1/8
Q: 130
P: (A2.B2)4
K: G
P: A
D | "G" G2 B BAB | "C" c2 A ABc | "D7" ded cBA | "G" B2 A G3  ||
P: B
Bc | "G" d2 d d2 B | c2 c "D7" B2 A | "G" ded BGB | "D7" c2 B A2 D |
   "G" G2 B BAB | "C" c2 A ABc | "D7" ded cBA | "G" B2 A G3 |]