can any1 explain the theory of chords like DΔ (the Δ bit)?
thanks
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It means the same as Dmaj7.

Those chords have a root, a major third, a perfect fifth and a major seventh from where the formula: 1 3 5 7 derives from.

In C: C E G B.

In D: D F# A C#

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the delta sign means "major 7"
the theory about that chord is that: you build a major triad(1-3-5) and add the natural seventh degree. for example,if you wanna build a Cmaj7,you first build the triad (c-e-g)
then you add the natural seventh,which you get by going down a half step from the root.
you`ll get the B note.
take Δ (delta) as a substitute for the words 'major 7'.

DΔ = Dmajor7.
DmΔ (or D-Δ = Dm/major7.

and so forth. Beyond that, it's typically used to notate the chord of the Ionian mode regardless of voicing. For instance, a voicing of Dmaj9 might be notated as DΔ.
thanks. I know what a maj 7 is just didnt know what the delta was for.
Thanks
Quote by elliott FTW
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silly racist bitch finally kicked the bucket