A Major triad has a "large" interval (Major 3rd) at the bottom, while a Minor triad has a "small" interval (Minor 3rd).
A (Whole tone) consists of two half steps (e.g., C to D). Music Theory 101: From Keys and Scales to Rhyth...
Sound "happy" or "bright." The formula is: W–W–H–W–W–W–H (Whole, Whole, Half...). A Major triad has a "large" interval (Major
Sharps raise a note by a half step; flats lower it by a half step. 2. Keys and Scales you create a chord.
Sound "sad" or "serious." The natural minor formula is: W–H–W–W–H–W–W .
When you play three or more notes at once, you create a chord.