Thank you Hanspeter, what you mentioned about 7th chords (7:30) is a cool rule of thumb! I knew that level V in the cadence should usually be a 7th chord, but I didn't know exactly why. Gemini replied to my question with this: The "rule of thumb" you're describing is not a hard-and-fast rule, but it is a very common and powerful technique. The practice of using a dominant 7th chord (V7) before a chord change is fundamental to what's known as a V-I cadence. Here's why it works and why it's so widely used: Tension and Resolution: A dominant 7th chord is inherently unstable and creates a strong sense of tension. The root of the chord is the fifth degree of the scale you are moving to (the "tonic"). The 7th of the chord creates a tritone with the 3rd, which is a very unstable interval. This tension creates a strong pull or need to resolve to the stable, tonic chord (the "I"). Creating Forward Motion: By placing a dominant 7th chord right before a new chord, you are essentially "setting up" the next chord. It creates a feeling of forward motion and expectation, making the chord change feel purposeful and satisfying. Defining the Key: This V-I relationship is the backbone of traditional harmony and is how we define a key. By playing a G7 chord, for example, the listener immediately anticipates a C major chord, which firmly establishes C as the tonic. Thanks and best regards, Roland