Identify the musical notation elements and any accompanying text.

The image displays a section of a musical staff with several clefs (likely treble clefs). There are also handwritten annotations that appear to be musical notes, possibly with directional indicators (arrows) and text. Some text is written in Cyrillic script. To the right, there's a visual aid labeled 'Клавиатура' (Keyboard) with piano keys depicted. The handwritten musical notations include symbols like 'bo' and other characters that could represent notes or chords, along with phrases such as 'ре, офа, соль минор'. The overall context suggests a music lesson or explanation on a blackboard.