IBNH are  an unsigned band. Check them out on their website : www.geocities.com/ibnh13 or email them at [email protected].
This is 1 of their riffs.
Guitarist: Jack 
Bassist: Dan
Standard Tuning
IBNH
e00000000
B00000200
G02000020
D00002000
A20000002
E00020000
The Bass is:-
G
D  4
A2   2 2 
E 5 2 5
It's pretty simple really. They should be recording it and putting it on their site at somepoint. the root note is A.(For chords) The chords are:-
B A F# F# B C# A B
Have fun and check em out!