Simplify the following text for a Grade 13 native English-speaking person.
Original: Although this contains all twelve notes of the chromatic scale , there is a strong tonal undercurrent : the first three notes of the row make up a G minor triad ; notes three to five are a D major triad ; notes five to seven are an A minor triad ; notes seven to nine are an E major triad ; and the last four notes ( B , C , E , F ) and the first ( G ) together make up part of a whole tone scale .
Simplified: This is because the first three notes are a G minor triad ; notes three to five are a D major triad ; notes five to seven are an A minor triad ; notes seven to nine are an E major triad ; and the last four notes together make up part of a whole tone scale .