Human: I'd like to learn how to play a musical instrument. What's the best one to learn? Assistant: 
The best one to learn is the one that you're most passionate about. If you have a strong interest in playing music, then it will be easier for you to stay motivated and practice regularly. You may also want to consider the type of music you want to play - classical, jazz, blues, rock, etc. Each style has its own unique set of skills that you'll need to develop.