The screenplay Pro is an excelent audio player as well, but unlike video files, we do play the same files over and over. The default operation is to navigate to a folder with music files (MP3 format generally) and hit the play button. It starts with the first file, then the second ect. Fine for video files where you want to see a tv series in a certain order, but deadly for audio. It requires three operations to randomise playing order. Adding other folders with music to the list requires again more operations.

How to set the player to play all music in a folder (including sub folders) at random by default.

How to create a playlist that actually works.