I'd suggest getting Shin Megami Tensei: Devil Survivor. It's a little hard, but it has a lot of content, in addition to having a really good storytree and some phenomenal writing.
As far as Lock's Quest, never heard of it. Try asking the employees at your local gaming emporium?
EDIT: Also, this is the main theme from SMT
S. Yes, the rest of the soundtrack is all rock influenced. No, this is the only one with vocals.
As far as Lock's Quest, never heard of it. Try asking the employees at your local gaming emporium?
EDIT: Also, this is the main theme from SMT