Chord request: Diminished Major 7th

[pdxdjazz]

Wouldn't the bass notes be different i.e., C to Eb. In one chord it would be C - C sharp (Db) - Eb. In the other, C - D natural - Eb.

I think in the player, a bass note designated by a slash is pedaled. (In this case C) the "walking scale" would be up to the reader. So you agree that just from a notes-in-chord perspective the two chords contain the same notes?

Cdim maj7 = C Eb Gb B
What notes are in B/C ?

)BOB

[raymb1]

I think in the player, a bass note designated by a slash is pedaled. (In this case C) the "walking scale" would be up to the reader. So you agree that just from a notes-in-chord perspective the two chords contain the same notes?

)BOB

Yes to your last question,
no to a walking bass line, B/C would have a C# and C dim Maj7 would have a D natural. F# or F and A or A#. Since I'm a pianist the bass line is more important to me.

[pdxdjazz]

Yup, it's just a suboptimal workaround for the chord quality.
)BOB

[CyrilleB]

This is why having this chord (dim maj7) in the library as stand alone chord is important.
The other reason is that other chords could be built with a dim maj7 using slash chords.
For ex: flamenco music often uses chords such as CdimMaj/B

[Jongleur]

Jjazzlab (backing-track desktop application, all platforms) has dimMaj7 chords.