Chord dosent sound right??? I'm making my way through the core learning level 1 and I have approached a song titled "three long days" by lisa mccormick.

For some reason all chords sound great apart from the B7 chord it sounds very strange.

I have restringed my guitar and made sure it is perfectly in tune. I am definitley playing the right notes and all notes ring perfectly but for some reason it still dosent sound right.

Any ideas will be appreciated