This is often the first comment someone makes after playing a harmonic minor tuned harmonica for the first time. Here is a book that book answers that question.

A collection of one hundred and one tunes selected and arranged for a ten hole harmonica in harmonic minor tuning, presented in both standard notation and tablature, gathered from a wide variety of sources - early Western composers, klezmer, the folk musics of the British Isles, Europe, Scandinavia, the Balkan countries, the Middle East and beyond. More than half of the tunes can be played without the use of note bending. Included are sea shanties, waltzes, bourrées, freilachs, schottisches, gavottes, belly dance tunes, Christmas carols, hymns and much more. Also included is some theoretical background on minor scales and related musical modes, plus layout diagrams for harmonic minor harps in all twelve keys.

Although primarily aimed at harmonica players, the tunes are also suitable for other melody instruments, such as flute, violin, melodica, etc.

The book contains a link to web page where .mp3 files of all the musical examples are available for free download.