Simplify the following text for a Grade 7 native English-speaking person.
Original: For example , the key of D minor is not conventionally used in notated music , because its corresponding key signature would contain a B ( submediant ) . An equal-tempered scale of D minor comprises the same notes as the C minor scale .
Simplified: For example , the key of D minor is not usually used to write music down , because its key signature would contain a B. An equal-tempered scale of D minor has exactly the same notes as the C minor scale .