System for reading music in different keys - uses cursor with key signatures sliding over sheet music

摘要

The cursor has a series of different and mixed keys placed on small staves which enable one to read musical notes. A vertical slot in the middle of the cursor enables it to be slid into each page of musical text. The text having only notes placed on staves without keys. By varying the position of the cursor one can obtain different readings with the possibility of several combinations. The keys being thus transposed. The cursor is engraved on the front and rear. The letters 'A' and 'B' is placed at the top left of each cursor. 'A' the first key of each cursor corresponds to the first stave of each lesson 'B' the second key of each cursor corresponds to the first stave of each lesson.