Thirteenth
![Dominant thirteenth extended chord: C E G B♭ D F A play . The upper structure or extensions, i.e. notes beyond the seventh, in red.](/Images/godic/202501/09/Upper-structure_triad3647.png")
![Dominant thirteenth chord in four-part writing[3] Play .](/Images/godic/202501/09/Dominant_thirteenth_chord_on_C_4_voice3647.png")
![Dominant thirteenth chord in Claude Debussy's Prélude à l'après-midi d'un faune (1894)[7] Play](/Images/godic/202501/09/Prelude_to_the_Afternoon_of_a_Faun_dominant_thirteenth_chord3647.png")
![Voice leading for dominant thirteenth chords in the common practice period.[8] Play](/Images/godic/202501/09/Thirteenth_chord_voice_leading3647.png")
In music or music theory, a thirteenth is the interval between the sixth and first scale degrees when the sixth is transposed up an octave, creating a compound sixth, or thirteenth. The thirteenth (an octave plus a sixth) is most commonly major Play or minor Play .