Had to learn "Blue monk" by Thelonious Monk but a version that was changed a bit by John Fourie (who taught my guitar teacher, and I'm using the exact piece of music he wrote out How cool is that) and has different chords substituted for the originals.

But there is one part that is like a Em7b5 into a G7b9 and not only is it extremely hard for me to switch at the speed we play it at, but the chords sound almost identical when I play them.

Any help in why it sounds the same or how to switch easier?
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Yeah it sounds *similar* because both chords have a diminished fifth and a minor seventh. The only difference is that the G7b5 has a major third and the em7b5 has a minor third.
[U]        | |                     [/U]
[U]        |/     .-.              [/U]
[U]       /|_     `-’       |      [/U]
[U]      //| \      |       |      [/U]
[U]     | \|_ |     |     .-|      [/U]
      *-|-*    (_)     `-’
And both have G and D notes in common.
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my neew year reslosutions are not too drikn as much lol.

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the chords will sound fairly similar

E - G - Bb - D = Em7b5

G - B - D - F - G# = G7b9

They share the notes - G & D and the others are only half steps apart.

Depending on the voicing, they could sound very similar.
If you want them to sound diferent, put the differing notes in the bass maybe?
Quote by branny1982

G - B - D - F - G# = G7b9

I'm sure you know this, but you should really call the G# an Ab, because it's a b9.

Quote by demonofthenight
The only difference is that the G7b5 has a major third and the em7b5 has a minor third.

The two chords are G7b9 and Em7b5

For changing between them, I find it's useful to look at notes the chords share and change the other notes around them (obviously keep fretting any notes that don't change if possible). Alternatively, if you suck as much as me, you could miss out the second chord when they change two to a bar and they're complicated, but I play with only a trumpet and drummer so there's no other rhythm instruments for me to clash with.
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Very good post Marmoseti, you're on the right track.

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Try playing them like this, shouldn't be too hard a change.

Em7b5 = x 7 8 7 8 x
G7b9 = x 10 9 10 9 x

(You can just bar the seventh fret for the Em7b5 and bar the ninth fret for the G7b9 if it's easier.)