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I wont give up- Jason Mraz
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is isn't exactly how he plays is cause I learn t it by ear and by watching him 
play it. But I hope it helps.

Tuning: standard
Capo: 2nd fret

Chords used:
   G (320003@1)name="chord_xx0232@1">D B (x2444x@1)name="chord_x02200@1">Asus2 Em (022000@1)name="chord_x32010@1">C Ee|-3-2-2-0-----0--0-0-----------------------------------------------| (022100@1)B|-3-3-3-0-----0--1-0-----------------------------------------------|
G|-4-2-4-2-----0--0-1-----------------------------------------------|
D|-5-0-4-2-----2--2-2-----------------------------------------------|
A|-5---2-0-----2--3-2-----------------------------------------------|
E|-3-----------0----0-----------------------------------------------|

Intro:
e|------------------------------------------------------------------|
B|-------------------------------------------------------------0h2--|
G|---------------4-4---2-2---2-2--------------------2-2-2--2---2----|
D|0-0-0---2-4----5-5---0-0---0-0?--x3---0-0-0--2-4--2-2-2--2--------|
A|---------------5---5-----0------------------------0----0---0------|
E|------------------------------------------------------------------|

e|--------------------------------------------------------|
B|--------------------------------------------------------|
G|-2------------------------------------------------------|
D|-2------------------------------------------------------|x2
A|---0----------------------------------------------------|
E|--------------------------------------------------------|

Verse:
e|------------------------------------------------------------------|
B|-------------------------------------------------------------0h2--|
G|---------------4-4---2-2---2-2--------------------2-2-2--2---2----|
D|0-0-0---2-4----5-5---0-0---0-0?--x3---0-0-0--2-4--2-2-2--2--------|
A|---------------5---5-----0------------------------0----0---0------|
E|------------------------------------------------------------------|

e|--------------------------------------------------------|
B|--------------------------------------------------------|
G|-2------------------------------------------------------|
D|-2------------------------------------------------------| x2
A|---0----------------------------------------------------|
E|--------------------------------------------------------|

Chorus: G, D, B, Asus2, G, D, Asus2
Verse: x1
Chorus
Bridge: Em, Asus2, Em, Asus2, C, E, C, E, D
Chorus
Verse:x1
Chorus: x3
Outro: G, D, G, D, G and end on D





This is how I play it in the video but I've found a different way to play the verses and 
intro that sounds a bit closer to what he's playing:

e|------------------------------------------------------------------|
B|------------------------------------------3-3---3-3--2------------|
G|-----------4-4---2-2---2------------------2----------2------------|
D|-0-0-0-2-4-5-----0---------x3--0-0-4-2-0--0---0----0--------------|
A|-----------5---5-----0--------------------------------------------|
E|------------------------------------------------------------------|

e|------------------------------------------------------------------|
B|------------------------------------------------------------------|
G|------------------------------------------------------------------|
D|------------------------------------------------------------------|
A|------------------------------------------------------------------|
E|------------------------------------------------------------------|



************************************
| /   slide up
| \   slide down
| h   hammer-on
| p   pull-off
| ~   vibrato
| +   harmonic
| x   Mute note
| b   Bend
| pb  Pre-bend
| br  Bend release
| pbr Pre-bend release
| brb Bend release bend
************************************