Question: How did the flute become the chosen musical instrument for Krsna by which He enthralls the entire creation?
Answer by Romapada Swami:
It is not true that Krishna plays only the flute. He also plays the buffalo horn, and if He wanted, He could play any instrument perfectly. He just likes to play the flute the best. This answer was provided by HG Laxmimoni dasi (https://www.krishna.com/why-does-lord-krishna-only-play-flute-there-anything-specifically-mentioned-somewhere)
