Final answer:
Joni Mitchell is distinct for incorporating complex jazz chords into her music, which sets her apart and reflects a blend of musical genres.
Step-by-step explanation:
Joni Mitchell's music is distinct because she incorporates complex jazz chords. Mitchell is known for her innovative guitar tunings, poetic lyrics, and complex harmonies which reflect a strong influence of jazz in addition to folk and rock elements. Her style is characterized by non-standard chord progressions and a rich, expressive vocal technique. Unlike many musicians who stick with more traditional or repetitive patterns, Mitchell's exploration of complex musicality has set her apart as a pioneer in the world of music, creating a unique and influential sound. This has earned her a place in the pantheon of singer-songwriters who are also regarded as serious musicians and composers.