Who reads the TRAEXS blog regularly knows about the many music publishing and sharing sites and who do publish dj sets or other kind of mixes probably looked for an option to mark particular tracks within a set, something usually not being possible.
This is different at the cloud music hosting service Mixcloud, where I just did some research for another service and by this just tried the upload feature for the first time for the associated site traex.de. And this feature is great at Mixcloud and it solves exactly the problem of marking particular tracks within a mix. Uploading happens by a common interface accompanied by facilities to add information as usual. After this common page a further particular page follows enabling to set time stamps marking the beginning and ending of particular tracks. This leads to displaying the right information at the right point while playing a file and even to navigation within a file like the embedded and comfortable Mixcloud player shows below. The service by the way is free and for more visit Mixcloud.