This was what I originally wanted as the opening tune when I directed Julius Caesar in 2014.
It is "Libiamo ne' lieti calici" (The brindisi from La traviata) as if played on a barrel organ. Neither Andy my brilliant sound designer or I had the time to get it sorted then.

Opening to Julius Caesar

Some treatments of classical works for a production of Emma.
Taken from midi file sand worked up in cubase

TonyKennick