<|im_start|>system
You are a helpful AI assistant.<|im_end|>
<|im_start|>user
Please list the four most common tunings for guitar. For each tuning, also provide an example of a popular tune played in that tuning and the fingerings required to play G, C,and D chords. Please format the chords in TAB.<|im_end|>
<|im_start|>assistant
Here are the four most common guitar tunings, along with examples of popular tunes in each tuning and the fingerings for G, C, and D chords:

1. Standard EADGBE Tuning
    - Example tune: "Sweet Home Alabama" by Lynyrd Skynyrd
    - G chord: 3 2 0 0 3 3
    - C chord: x 3 2 0 1 0
    - D chord: x 2 3 2 1 0

2. Open G Tuning (DGDGBD)
    - Example tune: "Slow Ride" by Foghat
    - G chord: 3 2 0 0 3 3
    - C chord: 3 3 0 2 3 3
    - D chord: x 0 2 2 1 0

3. Drop D Tuning (DADGBE)
    - Example tune: "Everlong" by Foo Fighters
    - G chord: 3 2 0 0 3 3
    - C chord: x 3 2 0 1 0
    - D chord: x 0 0 2 3 2

4. Open E Tuning (EBEGBE)
    - Example tune: "Black Dog" by Led Zeppelin
    - G chord: 3 2 0 0 3 3
    - C chord: x 3 2 0 1 0
    - D chord: x 2 3 2 0 0

The tunings and chords are formatted using TAB notation. Please let me know if you would like more information on guitar playing techniques, tunings, or chords. I'm happy to provide additional details or guidance.<|im_end|>
<|im_start|>user
In TAB format could you create a four chord progression using standard guitar tuning?  Can you also explain the strumming pattern?  Thank you.<|im_end|>
<|im_start|>assistant
Sure! Here's a simple four-chord progression in standard tuning using the chords G, Em, C, and D. This is a very common progression found in many popular songs.
``` 
G Chord:
e|---3---|
B|---0---|
G|---0---|
D|---0---|
A|---2---|
E|---3---|

Em Chord:
e|---0---|
B|---0---|
G|---0---|
D|---2---|
A|---2---|
E|---0---|

C Chord:
e|---0---|
B|---1---|
G|---0---|
D|---2---|
A|---3---|
E|---X---|

D Chord:
e|---2---|
B|---3---|
G|---2---|
D|---0---|
A|---X---|
E|---X---|
``` 
Strumming pattern:

For the strumming pattern, you can use a simple down-down-up, up-down-up pattern (D-DU-UDU). This pattern can be played once for each chord, as follows:

1. G Chord: D-DU-UDU
2. Em Chord: D-DU-UDU
3. C Chord: D-DU-UDU
4. D Chord: D-DU-UDU

Repeat this progression and strumming pattern as desired. You can also experiment with different strumming patterns and rhythms to create various styles and feels.<|im_end|>