This time we are looking at 7th chords. Practice working through them and try to remember them.
To make a 7th chord we take the 1st 3rd 5th and b7th (b7th means the you take the 7th note of the scale and flatten it)
So for example Cmajor, the 1st=C 3rd=E 5th=G 7th= B
For C7 we flatten the 7th so B becomes A#/Bb. The notes for C7 are C E G Bb.