I found a Paul McCartney Song..."Maybe I'm Amazed"... that showed a chord that still has me stumped:
D-10 is the name of the chord
Now, I understand that most chord names are 'even' (as opposed to odd) when they are within the initial octave. They then become 'odd' when the octave changes.....a "C2" would be a "C9" or "C4" would be a "C11"...but there is no 10th note when the octave change happens at the 8th note. ( referring to a major scale, of course )
...so what is a D-10 Chord?