I have a Hal leonard greek bouziki book and have started to learn ther does seem to be a lack of repertoire for the instrument, entirely Greek sourced, usually, all I require is a book of tunes/songs. I have other instruments plenty of repertoire. I usually return to classical music with them, J S Bach, Shubert, and suchlike. The bouzouki offers a different style totally. Practise is the requirement as with all things. Such a beautiful sound.