Q: I love making funky chords on the piano and such but I also wanna know what people are talking about when they add a seventh
A: if you have a c major chord (c, e, g) adding a major 7th note means adding B, and adding a flat seventh means adding Bb. it's like if you go up a C scale (c,d,e,f,g etc) and count 1,2,3,4,5 etc, it's the 7th note. which is either B or Bb depending on what mood you're in