It's a G major on 7th fret. Fret the opening chords like this: (first chord) : 1st string on 7th fret, 2nd string = 8th fret, 3rd string = 7th fret. (2nd chord): 1st str = 6th fret, 2str = 8th fret, 3rd str = 9th fret. REPEAT THAT. Next chord is the G on 7th fret again and then: G7 : 1st str = 10th fret, 2nd str = 12th fret, 3rd str = 10th fret. Then A7 : 1st str = 9th fret, 2nd str = 8th fret, 3rd str = 9th fret. Then D7: 1st str = 8th fret, 2nd str = 10 fr, 3 str =11fret.