Unknown Chord

[rpjazzguitar]

Saw one today. E(b5)/Eb. In a Hermeto Pascoal tune called Montreaux.

In Hermeto's original chart the chord is written E/Eb, but the melody note is a Bb, quarter note tied into an eighth note triplet.

Sequence is Gm7 G/B Cm7 Ebmaj7 E(b5)/Eb Eb/Db D/C.

Two beats each except for the E(b5)
/Eb and Eb/Db -- one beat each.

One place I can hear it is in Bbm7b5 to E(b5)/Eb to an Ab tonic, maybe Abm6 or Abminmaj7 or Abmaj7. A ii V I with a twist.

That is, it becomes an out-there Eb dominant sound. It can sub for either the iim7b5 or the V7(with alterations).

Try playing it x6788x.

Please chip in to the pile of unknown chords.

[pcjazz]

[ragman1]

I have several but I have no idea what they are

[Jimmy blue note]

Saw one today. E(b5)/Eb. In a Hermeto Pascoal tune called Montreaux.

Please chip in to the pile of unknown chords.

Might that not be some kind of voicing of a lydian chord, maybe a IVM with the 7th in the bass? Part of a line cliche? Sometimes there's a sound that's conveyed by a chord and we get into the debate of the functional rationalization of a chord, some justification given through a name when it's really a sound going to a sound.
A name isn't what gives a chord its justification or definition, sometimes it's something to call a group of notes that happens to describe movement from one place to another. There are plenty of times when chords can be perfect for a context, yet they defy naming so someone picks something that describes the assemblage of notes not necessarily functionally.
There are entire books of chords, especially in a voice led context, where it doesn't serve one well to attempt to name the chord.

[rpjazzguitar]

I posted it just because it's unusual.

The notes are Eb E Ab Bb.

If I had to find a more conventional name I might think about Emaj7b5/Eb.

Hermeto writes his chords his own way (at least at times), specifying a stack of intervals, rather than a chord name. I've heard him arrange a horn section by singing the notes to the players, including some unusual intervals.

[pauln]

Ebmaj7 to E(b5)/Eb might be described as two
Eb chords, second one named as Ebsus4addb9