On the staff, there are often some small eighth-note notes (smaller than normal notes), and there is a small slash on the stem. This small note is called "appliance". The sound sometimes appears in front of the tonic, and sometimes appears behind the tonic. Because it is a sound that is attached to the main sound, it is called "Yin".

Spring in the North Country" is a Japanese folk song composed in 1977 and became popular across Japan a year later. It is a song about missing hometown. Did the poster use electronic piano music? But the version of the electronic piano score I have does not have any appogy.