For example: in the key of C major, the notes of the scale are C, D, E, F, G, A, B in the key of D major, they are D, E, F#, G, A, B, C#.

The key of a song determines which notes are on the minor or major scale. But there are also methods for determining the key of a song by ear. However, it is not always easy to tell what key it is - unless you can read the scores, in which case there are rules that you will learn here. For example, if you know you're producing a song in A minor, you know right away that the chords A minor, D minor, and E minor will sound good. When you're producing music, it's important that you know a little bit about keys in order to play the melodies and chords on your instruments. Because in every key there are notes that sound 'right' and 'wrong'.

Or for when you produce your songs and combine different melodic instruments. Knowing the key of a song is important for understanding what notes you can and cannot play when jamming with other musicians. The key signatures determine the harmony of a song and are represented in the score by accidentals.

2 semitones down from d flat major