"用长笛吹奏" can be translated into English as "play on the flute" or more naturally as "play the flute".
"Play on the flute" emphasizes the act of using the flute as the instrument for playing.
"Play the flute" is a more common and concise expression in everyday English, directly indicating the action of performing music with a flute.
Both expressions are correct, but "play the flute" is generally preferred for its simplicity and naturalness.