I'm assuming everyones milage will vary when it comes to the betas, but for me, running on my 4s, I have not been able to just open Siri and have her recognize a song since beta 1.
I prefer it that way. When it was automatic it interfered with giving it commands.
Good point but if you want to find a song quickly, like during a commercial or something, it's much more cumbersome to do
especially since u r in a loud environment when u want to shazam most of the time so saying the command first is nearly impossible