Just a note about getting the best sound live:
Whether you use a laptop or an MP3 player etc. to play the backing tracks, be sure to turn up that laptop/player as far as you can without distortion, and then adjust the volume on the PA. You will ensure you are hearing the best quality sound. The principle of doing this is called gain staging.
BIAB 2019 Win Audiophile; [& 2018 Mac UltraPak]. Software: Cakewalk, Adobe Audition, Ozone, Encore; Win 10 64 Pro. Hardware: custom i7, 16 Gb; Roland Integra-7, Focusrite 18i20(2), TCE Finalizer, Behringer X-Touch, Adam sub & monitors.