1645 chord is C chord, followed by Am chord, followed by F chord and G chord. This sequence is called chord progression. It is also the most basic chord of C, Am, F and G in C major. 1 is the first chord, that is, c, 6 is the sixth chord, that is, Am. According to the order of CDEFGAB, analogy is made: II is Dm, III is Em, IV is F, V is G, and VII is B.
1645 chords are usually divided into major and minor. The so-called major is to start with C as the first chord and end with C chord. A minor, that is, with Am as the first chord and ending with Am or g.
Extended data:
Holding the piano in his left hand:
1, when the fingers of the left hand press strings, the left arm should be relaxed, the left arm and elbow naturally droop, and the wrist joint should not be excessively bent, so that the palm and wrist form an included angle of 120 degrees, so as to better complete various string pressing actions.
2. The thumb of the left hand should be kept naturally straight, with the pulp of the finger as the support point close to the center line of the neck and generally perpendicular to the neck, so it should be relaxed and naturally straight.
3. The first joint of other fingers is bent at a 90-degree angle with other fingers. Even if the joints are not straight, they can't stay. Get as close to the strings as possible.
4. When the finger of the left hand presses the string, the finger should be as close to the pin as possible, and the pronunciation is clearer and more accurate.