Movements to the following Bach pieces are marked Siciliano:

- Sonata #1 in G minus BWV 1001
- Sonata #2 in Eflat minor BWV 1031
- Keyboard Concerto in E, BWV 1053

Handel has a Siciliana movement in his Concerto Grosso #8 in C minor and
the "La Paix" movement in the Royal Fireworks music is subtitled "Largo
alla Siciliana"

If you want to get a feel (only!!) for these pieces, all of these can be
found at the following website

   http://www.prs.net/midi.html#index

You may be able to find other Siciliana/o/i pieces at this site.  There is
a Sicilienne by someone called Paradis which was written around 1800 --
outside your time period.

One more work of Bach - the second movement of the Concerto for 3
Harpsichords in D minor, BWV 1063 may be found at:

   http://www.jsbach.net/midi/midi_concertos.html

Regards ... Alex Soteros