Select Premium users are now able to access a beta that allows you to experiment with mixing tools for transitions between tracks.

Premium subscribers can now use the new Spotify Mix button to create DJ-style transitions between their playlist songs.

This allows users to make songs flow into each other instead of just letting one track abruptly finish and another begin. It sounds like an easy way to experiment with basic audio mixing features before getting to grips with more extensive mixing software such as Apple Logic Pro,