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Jazz can be considered hard to learn due to a few reasons:

1. Improvisation: One of the most challenging aspects of jazz is improvisation. It requires a deep understanding of music theory, scales, and chords, as well as the ability to think quickly and create original melodies on the spot.

2. Swing rhythm: The swing rhythm, which is the characteristic rhythm of jazz, can be tricky to master. It involves a specific way of subdividing time that is different from other music styles.

3. Ear training: Many jazz standards are old songs that were performed before being recorded, which means there are many versions of them. To learn a standard, you need to be able to listen to different recordings and transcribe the melody and harmony by ear.

4. Vocabulary: Jazz has a vast vocabulary of chords and progressions that are not commonly used in other styles of music.