Hey, I don't know if you've seen this flick, a while back, but, as so far as mixing humor with the blues.....check it out!
During the filming of this, Elizabeth Shue twice blows it, by cracking up, as you might be able to see, but it had such a charm, they left it in, and used this take!...enjoy!
http://www.youtube.com/watch?v=h0rY3dn5kos