I recently got Jumpin Jim's Daily Ukulele. I've been enjoying it quite a lot but I noticed that when a song calls out for a D7 Jim illustrates a D7 without a D (2020) which is actually a Gbdim or F#dim. In many cases when I substitute in a proper D7 (2223) I find it actually sounds better his way. So, why does he call it a D7 if it's not really a D7? I understand that with 9th and 11th chords you've got to drop the root but that's not the case with 7th chords and a D7 isn't that hard to play.
I assume he has a reason for doing this but to me he should just call the chord what it is. I'm confused.
I assume he has a reason for doing this but to me he should just call the chord what it is. I'm confused.