###  Four Common Tunings for Guitar

The four most common tunings for guitar are standard tuning, drop D tuning, open G tuning, and open D tuning. Here are examples of popular tunes played in each tuning, along with the fingerings required to play G, C, and D chords in TAB format:

1. **Standard Tuning (EADGBE)** - This is the most common tuning for guitar and is used in most styles of music. 

   **Example of a popular tune:** "Wonderwall" by Oasis
   
   **Fingerings for G, C, and D chords:**
   
       G:   320033
       C:   x32010
       D:   xx0232

2. **Drop D Tuning (DADGBE)** - In drop D tuning, the sixth string (E) is tuned down a whole step to D, which allows for power chords to be played with one finger.

   **Example of a popular tune:** "Kashmir" by Led Zeppelin
   
   **Fingerings for G, C, and D chords:**
   
       G:   5x0033
       C:   x32010
       D:   x00232

3. **Open G Tuning (DGDGBD)** - Open G tuning is used frequently in blues and slide guitar playing, and is often used by Keith Richards of the Rolling Stones.

   **Example of a popular tune:** "Brown Sugar" by The Rolling Stones
   
   **Fingerings for G, C, and D chords:**
   
       G:   0x0003
       C:   0x2010
       D:   0x4232

4. **Dropped D with Capo (DADGBD)** - This is a variation of drop D tuning that is often used in folk music.

   **Example of a popular tune:** "Blackbird" by The Beatles
   
   **Fingerings for G, C, and D chords:**
   
       G:   3x0003
       C:   x32010
       D:   xx0232
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