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: Old Tom of Oxford
M: C|
L: 1/4
K: Gmaj
B/c/ | "D" d e/f/ "G" g d | "D" c B A B/A/ | "G" G B/c/ d g | "D" f g a f/e/ |
       "D" d e/f/ "G" g d | "D" c B A e/f/ | "G" g d c B | "D" A B/A/ "G" G :|
z/A/ | "G" B d B d | "G" B d g/f/e/d/ | "C" c e c e | "C" c e g/f/e/d/ |
       "G" B d B c | "D" d e/f/ "G" g d | "G" g d c B | "D" A B/A/ "G" G :|