What does the +3 mean in G7+3?
It occurs in the piano part of Sleepy Lagoon (Harry James Orchestra). The context is as follows:
C | | | | | Am | D9 | |
G7+3 / G96 / | G7+3 / G96 / | G7 / Em F#m° | G7
I don't think it's a misprint, as it comes up again as G9+3 a few bars later. Since this is big-band jazz, it isn't plausible to me that it indicates to the player not to omit the 3rd as they would never consider doing that anyway.
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It's a really round about way of notating a G7sus4. The + is telling you to raise the note and the 3 is referring to the third of the chord so it's telling you to raise the 3rd. Since a raised major 3rd is just a 4th you'll typically see this chord as just G7sus4 which tells you to play a G7 with a 4th instead of a 3rd.
If you even search the chord symbol on jguitar it will display the results for G7+3, but name all the chords it shows G7sus4.
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