Regularise use of repeats, tune (A/B/C etc.) markers and final bar. 1. Only show tune markers when a tune change is in the middle of a line. 2. Only show repeat starts |: if the repeat start is in the middle of a line. 3. Final bar end mark must be a thick line. The official rules for a repeat are that if there is no left repeat marker |: then the repeat starts at the previous double bar.

X: 1
T: Balance the Straw
A: Fieldtown
M: 6/8
L: 1/8
Q: 120
K: G
P: A
D |: "G" G2 B BAB | "C" c2 A ABc | "D7" ded cBA |\
  [1 "G" B2 A G2 D :| [2 "G" B2 A GBc ||
P: B
|: "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 | [1 "G" B2 A GBc :| [2 "G" B2 A G3 |]