Add a A4 portrait book with multiple tunes per page. Also add a script to make all variants of a single book, and look for <tune name>.tex files, and if one exists add it after the tune.

#!/bin/sh

if [ $# != 1 ]; then
    echo "Usage: make.sh <book dir name>"
    exit 1
fi

booke=$1

find $booke -name "*.abc" | sort | xargs abcm2ps -F dottes.fmt -O $booke.ps