= diminished major seventh = augmented 5th = augmented minor seventh = Δ = augmented major seventh Rhythm and articulation NNS charts also use unique rhythmic symbols, and variations in practice exist. A diamond shape around a number indicates that the chord should be held out or allowed to ring as a whole note. Conversely, the marcato symbol ^ over the number, or a staccato dot underneath, indicates that the chord should be immediately choked or stopped. The "push" symbol ("<" and ">" are both used) syncopates the indicated chord, moving its attack back one-eighth note to the preceding "and". A sequence of several chords in a single measure is notated by underlining the desired chord numbers. (Some charts use parentheses or a box for this.) If two numbers are underlined, it is assumed that the chord values are even. In 4/4 time, that would mean the first chord would be played for two beats, and the second chord would be played for two beats. 2- 5 1 means a minor 2 chord for two beats, then a 5 chord for two beats, then a 1 chord for four beats. If the measure is not evenly divided, beats can be indicated by dots or hash marks over the chord numbers. Three dots over a given chord would tell the musician to play that chord for three beats. Alternatively, rhythmic notation can be used. Example "After You've Gone" by Creamer and Layton 1918 Verse, mm.7-23 ( and, for comparison, the score ): Chorus, mm.24-43 ( and, for comparison, the score ): See also Nashville E9 tuning and Nashville tuning (high strung) References External links Diamond on the 1 – a "gig bag book" by Nashville musician Jonathan Riggs that introduces the basic concepts of the Nashville Number System Interactive NNS chart Learn the Nashville Number System – information on rhythm notation is included in the Flash-based "Nashville Number System Quiz and Rhythm Tutorial". It also includes a separate Flash-based ear training quiz. Oral use example: "Ok.. it's a standard 12 bar in "G" but add a 2 on the bridge ...kick it off from the 5 ... hit the 4 on the way down, and then into the 1 ... watch me for the 2" The Nashville Number Fake Book by Trevor de Clercq – This book includes a detailed overview of the Nashville Number System as well as complete charts