What has happened to my website on google?

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I built my first micro niche site and I ran into a problem. I'll be quick.

I did me SEO research (6 mo worth) trying to figure out google and feel like i'm onto their scent like flies on a monkey. Well here's the problem..

Day 1 - registered my site

Day 4 - on page 5 of google

Day 5 - on page 2 (spot 1)

Day 7 - on page 1!!! (10th ranked for keyword)

Day 11 - its gone!!!

I didn't get banned, did change anything I was doing, kept the same momentum... what gives?!

my site is powerchordschart dot com

if anyone has any input it would be greatly appreciated...

thanks!