Final answer:
The expanded harmonic language draws from a rich tapestry of influences including jazz, world, classical, and contemporary music, each contributing its unique elements and styles.
Step-by-step explanation:
The expanded harmonic language draws on influences from various musical styles including jazz music, world music, classical music, and contemporary music. Jazz, being a genre that embodies improvisation and unique rhythmic complexities, contributes significantly to this expansion by introducing unconventional chords and improvisational techniques. Similarly, world music incorporates diverse scales and modal systems from different cultures, broadening the harmonic palette. Classical music has contributed its established forms and structures, which provide a foundation for expanding harmony. Contemporary music often challenges the status quo by experimenting with new sounds, textures, and forms, further pushing the boundaries of harmonic language.