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IMO a selection of tracks should be used which you usually listen to, and which are not of a very special kind. The selection isn't very critical, and it doesn't take extremely many tracks. But genre included is, and when talking about average bitrate genre information should be given.
If it's about pop music it's also important to include relatively new recordings for the main part. I changed my test set this year for this reason. Due to my age of 63 my old test set consisted of rather old recordings to a high percentage, recordings from the time before the loudness war. I exchanged most of them for newer recordings (and I increased the number of tracks). Average bitrate went up a few kbps.
IMO a selection of tracks should be used which you usually listen to, and which are not of a very special kind. The selection isn't very critical, and it doesn't take extremely many tracks. But genre included is, and when talking about average bitrate genre information should be given.
If it's about pop music it's also important to include relatively new recordings for the main part. I changed my test set this year for this reason. Due to my age of 63 my old test set consisted of rather old recordings to a high percentage, recordings from the time before the loudness war. I exchanged most of them for newer recordings (and I increased the number of tracks). Average bitrate went up a few kbps.