While working on a harmony for Irmgard and me in Musescore, i tought it would be nice to have it also in another notation.

Above a Musescore screenshot.

When using below button assignment, we can easily rewrite above into another notation.

Write musescore as MusicML/mxl Music xml.

Install xml2abc from https://wim.vree.org/svgParse/xml2abc.html

python xml2abc.py INPUTFILE.mxl output.abc

My abc file

X:1
T:Planxty Irwin
C:OCarolan
L:1/4
M:3/4
I:
K:G
V:1 treble nm="Henri" snm="H"
V:1
|: d | B2 d | c2 A | F2 A | G3/2 d/ B | A G F | G3/2 A/ B | D2 E | F2 d | B2 d | c2 A | F2 A |
 G3/2 d/ B | A G F | G3/2 A/ B | e d c | B2 d | B3/2 c/ B | B G B | c3/2 d/ c | c A F | G d e |
 c d e | d3/2 c/ A | d c A | B c d | c B A | F G A | G3/2 d/ B | A G F | G3/2 A/ B | e d c | B2 :|

Using below bash script you can convert this to PDF WITH concertina notations.
WARNING: I didn't include all keys (yet).
NOTE: Easy to adjust to other notations.

#!/bin/bash
if [ $# -lt 2 ]; then
    print "script orgname convertname"
    exit 1
fi
: > parced
org=$1
abc=$2
cat $1 | awk '/^\|/ {exit} {print}' > header
cat $1 | grep "|" | tr -d '[0-9]:/'> parse
(
cat parse | while read ; do 
echo $REPLY
echo -n "w: "

for word in $(echo $REPLY) ; do

	if [ "$word" == "|" ] ; then echo -n " | " 
	elif [ "$word" == "D" ] ; then echo -n " 2 ";
	elif [ "$word" == "G" ] ; then echo -n " 3 ";
	elif [ "$word" == "B" ] ; then echo -n " 4 ";
	elif [ "$word" == "d" ] ; then echo -n " 5 ";
	elif [ "$word" == "g" ] ; then echo -n " 6 ";
	elif [ "$word" == "b" ] ; then echo -n " 7 ";
	else echo -n " * "
	fi
done
echo ""

echo -n "w: "

for word in $(echo $REPLY) ; do

	if [ "$word" == "|" ] ; then echo -n " | " 
	elif [ "$word" == "F" ] ; then echo -n " 2 ";
	elif [ "$word" == "A" ] ; then echo -n " 3 ";
	elif [ "$word" == "c" ] ; then echo -n " 4 ";
	elif [ "$word" == "e" ] ; then echo -n " 5 ";
	elif [ "$word" == "f" ] ; then echo -n " 6 ";
	elif [ "$word" == "a" ] ; then echo -n " 7 ";
	elif [ "$word" == "E" ] ; then echo -n " 4' ";  # <============ example 2nd row
	else echo -n " * "
	fi
done
echo ""

done
) >> parced
cat header parced > $abc
abcm2ps -x -O - "$abc" | ps2pdf  -sPAPERSIZE=a4 - "$(echo  $abc | cut -f2 -d/ | sed 's/abc/pdf/g')"

Example output (Harmony part)