Christian Greinacher's Euphonium most closely resembles the Kalliston
range of organettes.  The smallest Kalliston, that without bells, uses
a zinc music band that is 110 mm wide, 1200 mm long and plays 24 notes.

Christian says that his music is brass but the photo shows a colour
more like zinc.  The Kalliston band overlaps by 10 mm at the joint,
which is comprised of two small brass studs which fit into a pair of
keyhole shaped slots in the other end, then each is covered by a thin
brass shim.  If one were to solder the band into a permanent ring the
dimensions would be as described by Christian.

This could be more than a coincidence.  It is possible that the
Euphonium was designed to play Kalliston bands and that Christian's one
band has previously been soldered into a complete ring due to damage.
Alternatively, the band is indeed different, but from the same supplier
using identical arrangements, and this leads on to a suggestion for new
music.  The handful of Kalliston owners could be asked to mark through
their music and this could be punched onto zinc strips.

Some years ago, Bob Yates in the USA was trying to organise a Kalliston
band copying programme but I think this never got off the ground.  If
he is reading this could he please report?

It is most unlikely that the music bands were originally soldered into
complete rings as this would make storage almost impossible since one
could not nest the individual rings as they are all of the same
circumference.  This therefore supports the above hypothesis.  I may
be totally wrong but I suggest that the Euphonium is a little known
brother of the Kalliston.

Kind regards from the English Midlands,
Nicholas Simons.