Back in 2015 I wrote a little plugin for beaTunes 4 that helped to quickly scan through a list of songs. For beaTunes 5 this plugin was promoted to a built-in feature. To activate it, just click on that little barcode button right below the elapsed time counter.
What happens when you activate scan-mode? It puts the player in a mode, in which it only plays a short part of each song before continuing with the next one. Which song part is played depends on the specific scan mode you choose. The three available options are: Beginning, third and prominent. They describe the start point for playback. Beginning and third are pretty self-explanatory. Prominent means that beaTunes will choose a segment of each track for you based on its automatic segmentation. Depending on the kind of music, this may work better or worse, i.e. YMMV.
But in any case, this feature allows you to sit back and relax while beaTunes gives you an impression of a playlist of your choice. BTW: The length of this short preview is configurable in the playback preferences.