High Quality Content by WIKIPEDIA articles! An added tone chord is a triadic chord with an extra "added" note, such as the added sixth. This includes chords with an added thirteenth and farther "extensions", but that do not include the intervening thirds as in an extended chord. The concept of added tones is further convenient in that all notes may be related to familiar chords. C Major chord with added sixth. An added sixth chord ends songs including Nirvana's "Smells Like Teen Spirit", Hank Williams' "Hey, Good Lookin'", Carl Perkins' "Movie Magg" and "Blue Suede Shoes", Ronnie Hawkins' "Red Hot", Chuck Berry's "Rock and Roll Music", Scotty Moore's accompaniment in Elvis Presley's "That's All Right (Mama)", and the Beatles' "She Loves You" and "Ballad of John and Yoko." The thirds in a mixed third chord, also split-third chord, a chord which includes as its third both the major and minor third, are usually separated by an octave or more