Music is always fun and always my other way of relaxing. I just listen to my favorite bands and artist and all the frustrations that I felt that day fades away. Something that music can do to soothe one's soul.
Learning a musical instrument is my other way to challenge myself. I like to be challenged sometimes though, I want to prove others that I am right and they are wrong, so I have to make the BEST effort I can in order to achieve.
However, before I start to teach myself how to play a musical instrument, being knowledgeable about the specific instrument parts would be the best part to do. Just like this http://www.guitarcenter.com/Keyboard-Synthesizers-Keyboards-MIDI.gc, I have no idea about what is this for and what instruments does needs this until now. Good luck to me and I hope to fulfill this goal.