5th dnd – Could a bird breed (Aarakocra) play the flute

RAW, there is no limitation.

As usual, the rules do not hold to heart, so Aarakocra can play any instrument as well as anyone else.

If you are looking for a well-fitting instrument for them, I would prefer something small / light (that is, not annoying theft) and strings, such as a small harp or a lyre, as their talons would make 39, excellent picks.

If we go further, we could even think about modifying the less suitable instruments to improve the user experience of Aarakocran. Imagine a flute with a mouthpiece and finger holes very specific to accommodate the beak and greenhouses.

Regarding the question of not needing a flute – me, as a human being, I can hiss, applaud and sing (not very well, but still) and yet, various musical instruments were a rather recent invention of our history.