Added note chord

An added tone chord is a non-tertian chord composed of a tertian triad and an extra "added" note. The added note is not a seventh (three thirds from the chord root), but typically a non-tertian note, which cannot be defined by a sequence of thirds from the root, such as the added sixth ( Play ) or fourth. This includes chords with an added thirteenth (a tertian note, six thirds from the root) and farther "extensions", but that do not include the intervening tertian notes as in an extended chord. The concept of added tones is further convenient in that all notes may be related to familiar chords.

An added sixth chord ends songs including Hank Williams' "Hey Good Lookin'",Chuck Berry's "Rock and Roll Music",Sam Cooke's "You Send Me", and The Beatles' "She Loves You" (McCartney on 8, Harrison on 6, Lennon on 5). Though the added sixth chord is rarely found inverted, examples include The 5th Dimension's recorded version of "Stoned Soul Picnic" (on 5).

...
Wikipedia