So when it comes down to life on earth, you can look at anything as an opportunity. Some things such as greef, pain, handicap might not feel too right. Though, they too, are opportunities towards enlightenment and happines.
Here s a cool playlist to start with :)
http://collectivelyconscious.net/articles/500-best-songs-for-the-evolution-of-consciousness/
It is said the Chinese word for crisis is made of 2 characters. The second one means opportunity.