This is the theme tune to the Disney version of the famous legend from 12/13th century Nottingham.

Here is the chord sequence. It's pretty basic, it just goes;

|G///|G/D/|G/C/|D/G/|

The time signature is mostly 4/4
The last bar is 6/4

This is the tab

e|-0---0---------------------0---0-----------------|
B|---4------1-1----------------4-----1-0-1-3-------|
G|----------------2-2-0----------------------------|
D|-------------------------------------------------|
A|-------------------------------------------------|
E|-------------------------------------------------|

e|-0---0----------3-1---------------0--------------|
B|---4------1-1-1-----1-------0-1-3---1------------|
G|------------------------2-0----------------------|
D|-------------------------------------------------|
A|-------------------------------------------------|
E|-------------------------------------------------|

If you're stuck, have a listen to the song.

In the meantime, enjoy!