The main four instruments are undoubtedly:but there is also amazing content on others which must not be missed, including:
Infinite Wikipedia instrument list: en.wikipedia.org/wiki/List_of_Chinese_musical_instruments
Stringless guqin fan painting by Feng Chaoran (1943)
Stolen traight from www.silkqin.com/10ideo.htm on silkqin.com:Wind in the pines and a babbling brook are nature's melody. A qin was brought along, but there is no need to play it