The following musical instruments are generally considered to be relatively easy choices for adult beginners, including jazz drums, guitar, keyboard/electric piano, jazz harmonica, and percussion instruments.

1. Jazz drumming: Although it requires coordination and rhythm, jazz drumming is relatively easy for adults to get started. It has many basic rhythm patterns and grooves, allowing learners to quickly feel the charm of music.

2. Guitar: Guitar is a popular musical instrument, and there are abundant resources for adults to learn guitar. By learning basic chords and strumming techniques, adults can quickly play some simple songs.

3. Keyboard/Electric Piano: The keyboard or electric piano is a relatively easy instrument to play. Their scale arrangement and simple key layout allow beginners to quickly understand and play some simple pieces.

4. Jazz harmonica: The harmonica has a relatively simple structure and playing skills. By learning blowing techniques and various scales, adults learning jazz harmonica can quickly play some simple melodies.

5. Percussion instruments: Percussion instruments such as snare drums, bongos, and wooden fish are relatively easy to play. They do not require too much knowledge of music theory and can play some simple rhythms with a sense of rhythm and hand-eye coordination.

Some major benefits of learning musical instruments for adults

1. Enjoy the fun of music: Learning musical instruments allows adults to enjoy the fun of music, play their favorite songs, and release stress. Add pleasure to life.

2. Improve brain function: Learning musical instruments can exercise the brain and enhance memory, attention and concentration. Playing an instrument requires processing multiple movements and information simultaneously, which contributes to brain coordination and cognitive development.

3. Enhance endurance and perseverance: Learning a musical instrument requires consistent practice and cultivation of patience and perseverance. By consistently practicing an instrument, adults can develop the qualities of self-discipline and persistence.

4. Improve coordination: Playing musical instruments requires physical coordination, especially for percussion and plucked instruments. By practicing a musical instrument, adults can improve hand-eye coordination and body coordination.

5. Enhance expression ability: Instrumental playing is a way of artistic expression. By learning musical instruments, adults can develop their own musical expression ability and use music to convey emotions and thoughts.

6. Social interaction and teamwork: Learning an instrument allows you to participate in a music team, ensemble or orchestra, and play together with other music lovers to enhance your social interaction and teamwork capabilities.

7. Reduce stress and anxiety: Music is thought to help reduce stress and anxiety, and learning an instrument can provide a positive form of entertainment that can help adults stay away from everyday stress.

8. Improve creativity and artistic appreciation: Learning musical instruments can cultivate creativity and artistic appreciation. Adults can further develop and expand their artistic horizons by creating their own musical compositions or listening to the music of others.