Thank you so much for your comments.
Yes, repetitiveness is typical for Greek/Balkan music, it's part of the
meditative element in it.
As for the drums, I did actually work quite a bit to take them away from
sounding monotonic, but I guess I have to work harder - or just hire a
drummer, after all.
As for the instruments, they were just played plainly, the way they have
been played forever in Greek music. Again, I should've spent more time in
arranging them.
Anyway, many thanks for your constructive and positive comments. I haven't
done this before (post a tune here) so was really pleased when I noticed
some replies.
Viktor