Johann Joachim Quantz, German flute player and composer (died 1773)

Johann Joachim Quantz was a German composer, flutist and flute maker of the late Baroque period. Much of his professional career was spent in the court of Frederick the Great, where he served as the king's flute teacher. Quantz composed hundreds of flute sonatas and concertos, and wrote On Playing the Flute, an influential treatise on flute performance. His works were known and appreciated by Bach, Haydn and Mozart.

January 30 is the 30th day of the year in the Gregorian calendar; 335 days remain until the end of the year.