diff --git a/makeCello.sh b/makeCello.sh
new file mode 100755
index 0000000..6bfa670
--- /dev/null
+++ b/makeCello.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+#
+# Copy a booke to cello-friendly form. Bass clef, transposed down 2 octaves.
+#
+# It would be easier to do with transpose in dottes.fmt, but I can't get
+# that to work properly for a 2 octave downward transpose.
+#
+# This relies on abcm2ps >= 6.0 but does not check for it.
+
+if [ $# != 1 ]; then
+    echo "Usage: makeCello.sh <book dir name>"
+    exit 1
+fi
+
+dir=`pwd`
+
+booke=$dir/$1
+outdir=$dir/$1-Cello
+
+mkdir -p $outdir
+
+find $booke -name "*.abc" | sort |
+    while read filename
+    do
+        name=`basename $filename .abc`
+        sed -e "/^ *K:/s/$/ octave=-2/" $filename > $outdir/$name.abc
+    done