The C major seven is a variation of the C major chord that adds a seventh.http://www.youtube.com/watch?v=_pW1QELFE2A Like all seven chords, this chord includes the major triad plus the seventh. The note formula for playing the C major seven is the root, the major third, the perfect fifth and lastly the seventh for a total of four notes.http://www.theguitarsuite.com/Theory/7-Chords.html 

A chord is a combination of multiple notes that are played simultaneously.http://www.musicmarks.com/guitarchorddefinition.html The C major seven, or Cmaj7, requires only two fingers at the neck of the guitar. This chord is frequently used in jazz and country music.http://www.theguitarsuite.com/Theory/7-Chords.html Watch the video and follow the steps below to begin practicing the Cmaj7 chord.http://www.youtube.com/watch?v=_pW1QELFE2A 

Review the string positions on your guitar before practicing the Cmaj7 chord. From left to right, they are low E, A, D, G, B and high E. Use "Elephants And Dogs Grow Big Ears" to help you remember.http://www.abclearnguitar.com/guitar-strings.html To fret the Cmaj7 chord, place your middle finger on the D string of the second fret and then hold the A string of the third fret with your ring finger. These are the only strings you need to hold for this chord.http://www.youtube.com/watch?v=_pW1QELFE2A 

After you feel comfortable with the finger placement, try strumming the chord. The Cmaj7 does not play the low E string, so start with the A string and pluck each string smoothly and consecutively until you hit the high E. Make sure the sound of the chord is fluid and unified. Try reforming and replaying the chord from memory to see if you have learned it. You might also want to try practicing the C major chord or other types of seven chords.http://www.youtube.com/watch?v=_pW1QELFE2A