Notation question (not necessarily bass)

[vindibona1]

I've played a lot of musicals over the years, more than I can count, trumpet, guitar, bass but have never seen notations represented as "diamonds" as the example below. The part is a guitar part, but they guy playing guitar is surely going to ask me what it means.
Does anyone hear know how the diamond notation is supposed to be played. Again, you're looking at a guitar part, so it would indicat how to play the corresponding chords above it
Any help is appreciated. TIA

 

[BassNugget]

It is simply the rhythm indicating how long the chord (noted above the staff) should be played. 1 beat of Bb, rest 3 beats, one beat of Eb, etc.

 

[BassNugget]

Not sure I answered the question. The first Gm7 would be played as a half-note, or two beats. The Gm in bar 10 would be 4 beats, a whole note. So, a rhythmic indication of chord changes.

 

[FatStringer52]

From the MuseScore Handbook . . .

 

[dreamadream99]

Rhythm charts sometimes use slash marks to indicate beats. To visually delineate, slash marks are wider — about the length of two spaces.

Occasionally, slash marks are used to indicate specific rhythms. To do this, stems are added.

The diamonds that you see are the half note and whole note versions of slash marks.

 

[Basstera]

This is called Chord Charts or Slash Notation Chord chart - Wikipedia

 

[Shenron]

I've played a lot of musicals over the years, more than I can count, trumpet, guitar, bass but have never seen notations represented as "diamonds" as the example below. The part is a guitar part, but they guy playing guitar is surely going to ask me what it means.
Does anyone hear know how the diamond notation is supposed to be played. Again, you're looking at a guitar part, so it would indicat how to play the corresponding chords above it
Any help is appreciated. TIA

View attachment 5322043

I confirm what the others have said: this score is a chord rhythm chart, in fact you can see that all of the slash/diamond-shaped notes are centered on the middle line, that's because they don't need to represent any pitch (the chord names on top tell you which chords you need to play, while the slash/diamonds tell you the rhythm pattern, as they are in fact just larger representations of quarter, half and whole notes in this particular example).

By the way, it's not a particularly new notation, I had these sort of scores 30 years ago when I started studying guitar.