When a DJ chooses the songs that he is going to play during a session, he doesn't only take into account the general mood of the lounge/disco or the style that the regulars like: the BPM (beats per minute) is one of the most important technical requirements. Two songs that are played at the same time have to have a similar BPM.
Find out the BPM of any song
One of the general problems of MP3 files is the possibility that its tags are incorrect, to such an extent that you can never know if the BPM that marked in the ID3 tag is really the correct amount, so it's essential to use an application like BPM Analyzer.
BPM Analyzer opens a song by simply dragging it to the application's window and in a matter of seconds, you will know the BPM with incredible accuracy, thanks to its powerful detection system.
As a complement, it is possible to search the BPM of a full audio library so that we can later print it on a sheet of paper.