how to analyse music stream

[Petr Jakes]

On the local radio station here in the Czech they announced simple
contest:
If listeners will hear Elton John's Sacrifice followed immediately by
Madonna's Frozen they have to call to the broadcasting. First caller
will get some price.

I am just thinking about the concept how to analyse music stream form
the PC radio card to get the signal: "first tones of Frozen were
played after Sacrifice, call to the studio" :-)

Of course, the calling can be made by PC as well, but this is the
easiest part of the task :)

Thanks for your tips and comments

Petr Jakes

PS: both, Linux or Windows tips are welcome :-))