Well here is part II with a subjective selection of YouTube videos.

Alpine region (Bavaria, Austria, Switzerland, Italy, Croatia)

Main instrument: Zither (zither)
https://www.youtube.com/watch?v=acsnaLCTPSk
https://www.youtube.com/watch?v=t07wEPfIIgE
https://www.youtube.com/watch?v=ZZ_KT-WxSN0
https://www.youtube.com/watch?v=d215_VKedCc
https://www.youtube.com/watch?v=BU9X20_o-TQ
https://www.youtube.com/watch?v=-plnftRpHSE

with vocals:
https://www.youtube.com/watch?v=ZjremYqmRHs
https://www.youtube.com/watch?v=XPDV_26oJcg


Main instrument: Hackbrett (hammered dulcimer)
https://www.youtube.com/watch?v=_JFEmLclGxQ
https://www.youtube.com/watch?v=AKH63sWdDuM
https://www.youtube.com/watch?v=E_1LCEFwBWc
https://www.youtube.com/watch?v=1kqxXJJScYM
https://www.youtube.com/watch?v=21IbIFnhPQA


Main instrument: accordion -- Steirische Harmonika
here: http://en.wikipedia.org/wiki/Steirische_Harmonika

https://www.youtube.com/watch?v=97KVF1T0dps
https://www.youtube.com/watch?v=NKeW8r_RAhc
https://www.youtube.com/watch?v=Wd66s0Tb_Rk

Main instrument: accordion -- Club Modell (club system)
here: http://en.wikipedia.org/wiki/Diatonic_button_accordion

https://www.youtube.com/watch?v=yHItKMbV9zU
https://www.youtube.com/watch?v=mnpJEa6anE8

Main instrument: accordion -- Schwyzerörgeli (little organ of Schwyz)
here: http://en.wikipedia.org/wiki/Schwyzer%C3%B6rgeli

https://www.youtube.com/watch?v=9DoTZoULjqc
https://www.youtube.com/watch?v=pCFycgTwFCI&list=PLC3B2A18A9371AFAC
https://www.youtube.com/watch?v=hxd_ekD4IQI
https://www.youtube.com/watch?v=54-d2HcLiyY
https://www.youtube.com/watch?v=vZFv6ZWLfs8

Main instrument: accoustic guitar

https://www.youtube.com/watch?v=aewkJyNod8M
https://www.youtube.com/watch?v=c0SOhfOhBdc starting at 2:06
https://www.youtube.com/watch?v=QJmML4wF6w0 includes a "Schrammelgitarre: http://en.wikipedia.org/wiki/Contraguitar)

Mixed instruments, brass and woodwinds included

https://www.youtube.com/watch?v=QdB8-q-qrcM
https://www.youtube.com/watch?v=vwLdjv5Ml5M
https://www.youtube.com/watch?v=Fyx9moYOPSI
https://www.youtube.com/watch?v=dCAUieRo6ec
https://www.youtube.com/watch?v=SIjvTNaDr2U


main instrument: Mundharmonika (mouth harp)

https://www.youtube.com/watch?v=X9D5Yt0hYII
https://www.youtube.com/watch?v=YWZ1LzxHA98
https://www.youtube.com/watch?v=jcmlSeWlr2A


main instrument: Maultrommel (jews harp)

https://www.youtube.com/watch?v=AE45mtADhfM
https://www.youtube.com/watch?v=lIBEPyKFlEM
https://www.youtube.com/watch?v=YkoQTzBFgqw



This should keep you busy for a while. In the meantime I check out other regions of Germany. Maybe somebody here on the German forum helps with music from his/her area.

Best regards.
Guido


Desktop; i7-2600k, 8 GB mem., Win 10 Pro, BIAB 2017; RB 2017 - latest build
Laptop: i5-2410M, 4 GB mem, Win 10 Pro, BIAB 2017; RB 2017 - latest build