Track length

CD rips can be cut. One common standard to compare length of files would be the trailing-leading silence free duration.

Example: El abrojo

http://www.tango.info/00731453340121-1-12

H. from CDex has 2:50, D. from cover has 2:40, T. from Winamp has 2:53.

As far as I can see H.'s length for the other tracks are 2 to 3 seconds longer than the ones from T., maybe due to ripping with silence vs ripping without silence.

El abrojo then is really special. The music on T.'s copy stops at 2:48. When playing the last value Winamp shows is 2:52, but in the track list it shows it as 2:53. The 2:40 from D.'s cover makes El abrojo a good showcase for how much variety for track length may exists - and the underlying speed of the audio may be the same for all.