Hi Mick. A Capital letter L before a note in ABC code will give accent marks above or below the note. In the one ABC program that will play the file the emphasis is not heard but it is there to be read.

X:1
T:Alemanha
N:capital letter L before a note for accents
M:3/2
L:1/8
K:G
|:BB GA B2 GA B4| LcB A2 LEG FA G4:|
|:AA Bc d2 AB c4| Ldc BA LG2 cB A4|
Bd GA B2 GA B4| LcB A2 LEG FA G4 :|

I just think that this is easier to read.