G----4-1-------5-2-------6-3-------7-4
D---3---2-----4---3-----5---4-----6---5
A--2-----3---3-----4---4-----5---5-----6
E-1-------4-2-------5-3-------6-4-------7

G----4-1-------5-2-------6-3-------7-4
D---3---2-----4---3-----5---4-----6---5
A--2-----3---3-----4---4-----5---5-----6
E-1-------4-2-------5-3-------6-4-------7

G----4-1-------5-2-------6-3-------7-4
D---3---2-----4---3-----5---4-----6---5
A--2-----3---3-----4---4-----5---5-----6
E-1-------4-2-------5-3-------6-4-------7

G----4-1-------5-2-------6-3-------7-4
D---3---2-----4---3-----5---4-----6---5
A--2-----3---3-----4---4-----5---5-----6
E-1-------4-2-------5-3-------6-4-------7

G----4-1-------5-2-------6-3-------7-4
D---3---2-----4---3-----5---4-----6---5
A--2-----3---3-----4---4-----5---5-----6
E-1-------4-2-------5-3-------6-4-------7

G----4-1-------5-2-------6-3-------7-4
D---3---2-----4---3-----5---4-----6---5
A--2-----3---3-----4---4-----5---5-----6
E-1-------4-2-------5-3-------6-4-------7
it is the bass tree