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: Sonny Brogan's Mazurka
M: 3/4
L: 1/8
R: mazurka
K: Dmaj
|: FG | A2 AG FA | d2>A2 BA | G2 GB AG |
| FG EF DF | A2 AG FA | d2>A2 BA | G2 Gg fe | d4 :|
|: e2 | f2 fa gf | e2 eg fe | d2 df ed | cd Bc A2 |
| f2 fa gf| e2 eg fe | dc df ec | d4 :|