Hello. I have a really easy and stupid question to ask (sorry I'm a complete novice in composing). From 1:08 to 1:14 in here

http://www.youtube.com/watch?v=p1XD1MSES_8

Is a melody I really like. I've heard this thing in a lot of places. I searched for the original manuscript

http://petrucci.mus.auth.gr/imglnks/usimg/d/dd/IMSLP04395-Bach_-_BGA_-_BWV_578.pdf

It starts on page 2 line 2 bar 3 but it only have 3 "lumps" of the melody, whereas the video has 4 lumps. By a lump I mean the groups D,G,F,Eb and G,C,Bb,A and C,F,Eb,D. I used my ear to continue it as the lumps F,Bb,A,G and Bb,Eb,D,C, so that makes 5 lumps together. However I'm sure from my listening experience there's a 6th lump, but I can't seem to place it. Can somebody tell me what the 6th lump is?

I know this may be a little off topic in a piano forum so does anyone know any forum where there are people to help newbie composers like me?

Try Young Composers. A great website for both young composers and people just starting off composition.