A major 7th chord is constructed by combining the 1st, 3rd, 5th, and 7th tones (notes) of a major scale. This represents an interval combination of root (1st), major third (3rd), perfect fifth (5th) and major seventh (7th). So to form a C major 7th we would use the scale tones C, E, G, and B. The symbols for a major 7th are Major 7, M7 or Maj7. Whenever you see these symbols or names following a piano note (C, D, Eb, etc.), this designates that a major 7th chord is to be played.
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