fingering in the Russian music sheet

[bandoneon.hk]

Hello,

I am trying to understand an accordion sheet I found in Internet.

I believe this is for B system and the first 8 bars are for freebass. please correct me if I am wrong.

1. Could anyone explain what does the B in bass side mean?
2. Is 2 the index finger and 5 the pinky finger?

Thank you in advance.

 

[Dingo40]

1. Could anyone explain what does the B in bass side mean?

In German musical notation, the letter "B" is used to represent what in English notation is called "B-flat," and the letter "H" is used for what in English notation is called "B." This practice dates back to the 17th century
I think Russians use the same convention

 

[ChrisH]

The notes marked B would be played on the counter-bass row on Stradella bass. This would fit in with the fingering shown.

 

[Siegmund]

Chris is correct.

These markings aren't shown often in non-beginner Russian sheet music... but if they are, B stands for "вспомогательного ряда," "auxiliary row," (and can be cancelled by O for "основного ряда," main row.)

 

[tcabot]

That's it about the "B" sytmbol. But it's not for freebass - just regular stradella basses.
In regard to your second question, there are at least 3 systems in existence: 4-finger 3-row; 5-finger-3-row and 5-finger 5-row.
In older 4-finger publications 1 is index, 4 is pinky. In newer ones 1 is thumb, 5 is pinky.

If memory serves me right, in non-beginner scores "В" at the start of the bar, sometimes inside a square can mean "Free bass", while "Г" means to switch back to Stradella basses.