No. As with learning an instrument, we recommend you start with a new language or instrument. You boost your brainpower by challenging it, and you will not receive the benefits of this mental exercise if you play already-learned songs or practice a language that you speak fluently.

Choose a new language or instrument or if you stick to one that you’ve already started learning, make sure that you are stimulating your brain with challenging songs or a fresh set of vocabulary/grammatical structure.