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
25 musical instruments OF China by Learning Music Hub
. Source. Great video, covers all the most important ones briefly with examples of varying relevance.www.facebook.com/131402556881886/posts/655763214445815/ gives an origin:The silkqin.com entry: www.silkqin.com/04qart/07sqmp/57ls.htm does not mention this however.
Li Sao was composed by Cheng Kangshi in late Tang dynasty based on the poem Li Sao, authored by Qu Yuan (340-278 BC) in the Warring States period of ancient China.
Li sao performed by Guan Pinghu
. Source. Track from Master Of Traditional Chinese Music: guqin
A Jackdaw is a type of crow: en.wikipedia.org/wiki/Western_jackdaw
Considered one of the 10 famous Chaozhou music pieces TODO list.
Was also adapted by Liu Baoshan (1937-1997) as a pipa song. Ciro Santilli prefers the pipa version.
Bibliography:
Jackdaw Playing With Water performed by Xu Lingzi on the guzheng at the Wiener Musikverein
. Source. Jackdaw Playing With Water performed by Lin Shicheng on the pipa
. Source. 
Old illustration of Zhu Bajie
. Source. Needs better identification: en.wikipedia.org/wiki/Talk:Zhu_Bajie#Illustration_date_wrong:_15h_century?
Lance instructor of the 800,000 Imperial Guards (八十万禁军枪棒教头). TODO understand the "枪棒" part: zhidao.baidu.com/question/206659649.html.
The adopted son of Gao Qiu wanted to fuck his wife, and because of this they frame him of planning to take revenge by killing Go Qiu, even though Lin Chong had decided not to take revenge to avoid harming his wife further.
They just keep trying to kill him, until at one point he just gives up and becomes a fugitive.
His story is well told in The Water Margin.
Usually called by others as 林教头 (lin jiaotou, literally Head Instructor Lin, but usually translated as just Instructor Lin).
The ball game is named cuju.
He is extremely despicable and petty, enjoys only useless things, and is vengeful and disloyal. Rooting for sport teams is stupid.
Surely his family name 俅 is a pun on the same sounding character 求 for ball.
Early on, he's usually called by others as Major Lu (魯提轄).
His original name is Lu Da 魯達
He then receives the Buddhist name Zhishen (智深, profound wisdom) during conversion.
Erniang is way more popular than her ranking in the 108 Stars of Destiny.
This is of course in part because she is one of the only 3 108 Stars of Destiny women. But her story about making human mantou is particularly fun!
She's also quite seductive, which gives directors a good opportunity for a bit of fan service. See e.g. kknews.cc/history/6epp2pp.html for a still from The Water Margin showing some good cleavage for example.
Uploaded at: uploads.worldlibrary.net/uploads/pdf/20130423230739the_outlaws_of_the_marsh_pdf.pdf TODO legality? World Library seems like a legit website. Reads "Copyrighted materials".
"The Capital" is what now is Kaifeng in Shandong, and it used to be the capital during the (Northern) Song dynasty.
In the novel it is simply often simply called as 东京 (capital of the East), which is now highly ambiguous term that can indicate several different historical capitals! Notably it is the name of modern tokyo.
There are unlisted articles, also show them or only show them.