Learning a new language or a musical instrument can benefit the brain. Both activities have been shown to have a number of cognitive benefits, including:

1. Improved memory: Learning a new language or musical instrument requires the use of memory skills, such as the ability to remember new words or musical notes. This can help to improve overall memory function.
2. Increased cognitive flexibility: Learning a new language or musical instrument requires adapting to new information and switching between different tasks. This can help to improve cognitive flexibility, or the ability to think creatively and adapt to new situations.
3. Enhanced problem-solving skills: Both activities require problem-solving skills, such as figuring out how to pronounce a new word or playing a difficult musical passage. This can help to improve overall problem-solving abilities.
4. Improved language skills: Learning a new language can have many benefits for language skills, including improved vocabulary, reading comprehension, and the ability to understand and produce new sounds.
5. Increased creativity: Learning a musical instrument has been shown to increase creativity, as it requires imagination and self-expression.

It is important to note that these benefits are not limited to adults – children who learn a new language or musical instrument may also experience cognitive benefits. However, it is important to find an enjoyable and motivating activity to maximize the benefits.