Back then harmonicas were all the rage. In comparison to violins and pianos, harmonicas were inexpensive and easy to learn and carry. Almost everyone had one. Kuo immersed himself in their musical world.
當時吹奏口琴的風氣頗盛，由於小提琴和鋼琴價格昂貴，相較之下，口琴便宜、易學且攜帶方便，當時幾乎人手一支，郭芝苑也沉浸在口琴的樂聲世界中。