Which mouth-blown instrument was among the first musical instruments played in outer space during NASA's 1965 Gemini 6 mission?

Harmonica

Wally Schirra played “Jingle Bells” on an eight-note Hohner “Little Lady” harmonica while Tom Stafford accompanied him with small bells aboard Gemini 6A in December 1965. NASA identifies the harmonica and bells together as the first musical instruments played in outer space.