It's really hard to think of a title for these that actualy get attention besides "help".
Title the thread to what the topic is. If you want help, that's the best way...It's not about getting attention. It's about getting someone that knows the answer. All the attention in the world isn't going to help, unless someone knows the answer.
As for your problem, it sounds close to impossible to do, especially on the fly, and especially with songs that dynamically change beats/min. throughout the song.
Write your own songs and you will know the beats per minute.