2007 - Frets On Fire.... I was just a little kid back then... Was fascinated by guitars and wanted to find a program that you can play guitar through keyboard... that's how I founded Frets On Fire...
2008 to 9 - Rockfree... I came upon this game purely by coincidence, it was the first rhythm game I started playing seriously.
2009 - Rockband Unplugged PSP... Having nothing to do when I was in cram school, I found and installed this game to my psp, teachers got mad at me for playing it though...
2009 to 11 - Jamlegend.... As the name says, the game was legendary. I still miss that game, too bad they shut it down.
2010 - Guitar Hero... My best-friend had Guitar Hero, we would always play together, he played the bass and I played the guitar...
2012 Continuing - Osu... That's when my real obsession with rhythm games started, sometimes ditching school just to practise more, etc.
After all that years, I probably have 1-1.5 years worth play time but I'm not even close to ET >__>